diff --git a/RainmeterStudio.Core/RainmeterStudio.Core.csproj b/RainmeterStudio.Core/RainmeterStudio.Core.csproj
index 4adacb8d..0ace9d96 100644
--- a/RainmeterStudio.Core/RainmeterStudio.Core.csproj
+++ b/RainmeterStudio.Core/RainmeterStudio.Core.csproj
@@ -47,6 +47,7 @@
     <Reference Include="WindowsBase" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Editor\Features\ToolboxItem.cs" />
     <Compile Include="Model\IProjectTemplate.cs" />
     <Compile Include="RainmeterStudioPluginAttribute.cs" />
     <Compile Include="PluginExportAttribute.cs" />
@@ -70,9 +71,11 @@
     <Compile Include="Utils\InputHelper.cs" />
     <Compile Include="Utils\LinqExtension.cs" />
     <Compile Include="Utils\BitmapHelper.cs" />
+    <Compile Include="Utils\ObservableDictionary.cs" />
     <Compile Include="Utils\PathHelper.cs" />
     <Compile Include="Utils\Version.cs" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/RainmeterStudio.Core/Utils/ObservableDictionary.cs b/RainmeterStudio.Core/Utils/ObservableDictionary.cs
new file mode 100644
index 00000000..6fff1d9a
--- /dev/null
+++ b/RainmeterStudio.Core/Utils/ObservableDictionary.cs
@@ -0,0 +1,321 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RainmeterStudio.Core.Utils
+{
+    public class ObservableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, INotifyCollectionChanged, INotifyPropertyChanged
+    {
+        private Dictionary<TKey, TValue> _dict;
+
+        #region Events
+
+        /// <summary>
+        /// Triggered when the items of the collection change
+        /// </summary>
+        public event NotifyCollectionChangedEventHandler CollectionChanged;
+
+        /// <summary>
+        /// Triggered when a property changes
+        /// </summary>
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        #endregion
+
+        #region Constructors
+
+        /// <summary>
+        /// Initializes a new instance of the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// class that is empty, has the default initial capacity, and uses the default
+        /// equality comparer for the key type.
+        /// </summary>
+        public ObservableDictionary()
+        {
+            _dict = new Dictionary<TKey,TValue>();
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// class that contains elements copied from the specified System.Collections.Generic.IDictionary&lt;TKey,TValue&gt;
+        /// and uses the default equality comparer for the key type.
+        /// </summary>
+        /// <param name="dictionary">
+        /// The System.Collections.Generic.IDictionary&lt;TKey,TValue&gt; whose elements are
+        /// copied to the new System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;.
+        /// </param>
+        /// <exception cref="System.ArgumentNullException">dictionary is null</exception>
+        /// <exception cref="System.ArgumentException">dictionary contains one or more duplicate keys</exception>
+        public ObservableDictionary(IDictionary<TKey, TValue> dictionary)
+        {
+            _dict = new Dictionary<TKey,TValue>(dictionary);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// class that is empty, has the default initial capacity, and uses the specified
+        /// System.Collections.Generic.IEqualityComparer&lt;TKey&gt;.
+        /// </summary>
+        /// <param name="comparer">
+        /// The System.Collections.Generic.IEqualityComparer&lt;TKey&gt; implementation to use
+        /// when comparing keys, or null to use the default System.Collections.Generic.EqualityComparer&lt;TKey&gt;
+        /// for the type of the key
+        /// </param>
+        public ObservableDictionary(IEqualityComparer<TKey> comparer)
+        {
+            _dict = new Dictionary<TKey, TValue>(comparer);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// class that is empty, has the specified initial capacity, and uses the default
+        /// equality comparer for the key type.
+        /// </summary>
+        /// <param name="capacity">
+        /// The initial number of elements that the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// can contain.
+        /// </param>
+        /// <exception cref="System.ArgumentOutOfRangeException">capacity is less than 0</exception>
+        public ObservableDictionary(int capacity)
+        {
+            _dict = new Dictionary<TKey, TValue>(capacity);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// class that contains elements copied from the specified System.Collections.Generic.IDictionary&lt;TKey,TValue&gt;
+        /// and uses the specified System.Collections.Generic.IEqualityComparer&lt;TKey&gt;.
+        /// </summary>
+        /// <param name="dictionary">
+        /// The System.Collections.Generic.IDictionary&lt;TKey,TValue&gt; whose elements are
+        /// copied to the new System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;.
+        /// </param>
+        /// <param name="comparer">
+        /// The System.Collections.Generic.IEqualityComparer&lt;TKey&gt; implementation to use
+        /// when comparing keys, or null to use the default System.Collections.Generic.EqualityComparer&lt;TKey&gt;
+        /// for the type of the key.
+        /// </param>
+        /// <exception cref="System.ArgumentNullException">dictionary is null</exception>
+        /// <exception cref="System.ArgumentException">dictionary contains one or more duplicate keys</exception>
+        public ObservableDictionary(IDictionary<TKey, TValue> dictionary, IEqualityComparer<TKey> comparer)
+        {
+            _dict = new Dictionary<TKey, TValue>(dictionary, comparer);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// class that is empty, has the specified initial capacity, and uses the specified
+        /// System.Collections.Generic.IEqualityComparer&lt;TKey&gt;.
+        /// </summary>
+        /// <param name="capacity">
+        /// The initial number of elements that the System.Collections.Generic.Dictionary&lt;TKey,TValue&gt;
+        /// can contain.
+        /// </param>
+        /// <param name="comparer">
+        /// The System.Collections.Generic.IEqualityComparer&lt;TKey&gt; implementation to use
+        /// when comparing keys, or null to use the default System.Collections.Generic.EqualityComparer&lt;TKey&gt;
+        /// for the type of the key.
+        /// </param>
+        /// <exception cref="System.ArgumentOutOfRangeException">capacity is less than 0</exception>
+        public ObservableDictionary(int capacity, IEqualityComparer<TKey> comparer)
+        {
+            _dict = new Dictionary<TKey, TValue>(capacity, comparer);
+        }
+
+        #endregion
+
+        #region IDictionary<TKey, TValue>
+
+        /// <summary>
+        /// Gets the number of key/value pairs contained in the dictionary.
+        /// </summary>
+        public int Count
+        {
+            get { return _dict.Count; }
+        }
+
+        /// <summary>
+        /// Gets a collection containing the keys in the dictionary.
+        /// </summary>
+        public ICollection<TKey> Keys
+        {
+            get { return _dict.Keys; }
+        }
+
+        /// <summary>
+        /// Gets a collection containing the values in the dictionary.
+        /// </summary>
+        public ICollection<TValue> Values
+        {
+            get { return _dict.Values; }
+        }
+
+        /// <summary>
+        /// Gets or sets the value associated with the specified key.
+        /// </summary>
+        /// <param name="key">The key of the value to get or set</param>
+        /// <returns>
+        /// The value associated with the specified key. If the specified key is not
+        /// found, a get operation throws a <see cref="System.Collections.Generic.KeyNotFoundException"/>,
+        /// and a set operation creates a new element with the specified key.
+        /// </returns>
+        /// <exception cref="System.ArgumentNullException">key is null</exception>
+        /// <exception cref="System.Collections.Generic.KeyNotFoundException">The property is retrieved and key does not exist in the collection.</exception>
+        public TValue this[TKey key]
+        {
+            get
+            {
+                return _dict[key];
+            }
+            set
+            {
+                TValue oldValue;
+                TryGetValue(key, out oldValue);
+
+                _dict[key] = value;
+
+                if (CollectionChanged != null)
+                    CollectionChanged(this, new NotifyCollectionChangedEventArgs(
+                        NotifyCollectionChangedAction.Replace, 
+                        new KeyValuePair<TKey, TValue>(key, oldValue), 
+                        new KeyValuePair<TKey, TValue>(key, value)));
+            }
+        }
+
+        /// <summary>
+        /// Adds the specified key and value to the dictionary.
+        /// </summary>
+        /// <param name="key">The key of the element to add</param>
+        /// <param name="value">The value of the element to add. The value can be null for reference types.</param>
+        /// <exception cref="System.ArgumentNullException">key is null</exception>
+        /// <exception cref="System.ArgumentException">An element with the same key already exists in the dictionary.</exception>
+        public void Add(TKey key, TValue value)
+        {
+            _dict.Add(key, value);
+
+            if (CollectionChanged != null)
+                CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, new KeyValuePair<TKey, TValue>(key, value), null));
+        }
+
+        /// <summary>
+        /// Removes all keys and values from the dictionary.
+        /// </summary>
+        public void Clear()
+        {
+            _dict.Clear();
+
+            if (CollectionChanged != null)
+                CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+        }
+
+        /// <summary>
+        /// Determines whether the dictionary contains the specified key.
+        /// </summary>
+        /// <param name="key">The key to locate in the dictionary</param>
+        /// <returns>true if the dictionary contains an element with the specified key; otherwise, false.</returns>
+        /// <exception cref="System.ArgumentNullException">key is null</exception>
+        public bool ContainsKey(TKey key)
+        {
+            return _dict.ContainsKey(key);
+        }
+
+        /// <summary>
+        /// Removes the value with the specified key from the dictionary.
+        /// </summary>
+        /// <param name="key">The key of the element to remove</param>
+        /// <returns>
+        /// true if the element is successfully found and removed; otherwise, false.
+        /// This method returns false if key is not found in the dictionary.
+        /// </returns>
+        /// <exception cref="System.ArgumentNullException">key is null</exception>
+        public bool Remove(TKey key)
+        {
+            TValue oldValue;
+            _dict.TryGetValue(key, out oldValue);
+
+            bool res = _dict.Remove(key); 
+
+            if (res && CollectionChanged != null)
+                CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, new KeyValuePair<TKey, TValue>(key, oldValue)));
+
+            return res;
+        }
+
+        /// <summary>
+        /// Gets the value associated with the specified key.
+        /// </summary>
+        /// <param name="key">The key of the value to get</param>
+        /// <param name="value">
+        /// When this method returns, contains the value associated with the specified
+        /// key, if the key is found; otherwise, the default value for the type of the
+        /// value parameter. This parameter is passed uninitialized.
+        /// </param>
+        /// <returns>
+        /// true if the dictionary contains an element with the specified key;
+        /// otherwise, false.
+        /// </returns>
+        /// <exception cref="System.ArgumentNullException">key is null</exception>
+        public bool TryGetValue(TKey key, out TValue value)
+        {
+            return _dict.TryGetValue(key, out value);
+        }
+
+        #endregion
+
+        #region ICollection<KeyValuePair<TKey, TValue>>
+
+        void ICollection<KeyValuePair<TKey, TValue>>.Add(KeyValuePair<TKey, TValue> item)
+        {
+            ((ICollection<KeyValuePair<TKey, TValue>>)_dict).Add(item);
+
+            if (CollectionChanged != null)
+                CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item, null));
+        }
+
+        bool ICollection<KeyValuePair<TKey, TValue>>.Contains(KeyValuePair<TKey, TValue> item)
+        {
+            return ((ICollection<KeyValuePair<TKey, TValue>>)_dict).Contains(item);
+        }
+
+        void ICollection<KeyValuePair<TKey, TValue>>.CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
+        {
+            ((ICollection<KeyValuePair<TKey, TValue>>)_dict).CopyTo(array, arrayIndex);
+        }
+
+        bool ICollection<KeyValuePair<TKey, TValue>>.IsReadOnly
+        {
+            get { return ((ICollection<KeyValuePair<TKey, TValue>>)_dict).IsReadOnly; }
+        }
+
+        bool ICollection<KeyValuePair<TKey, TValue>>.Remove(KeyValuePair<TKey, TValue> item)
+        {
+            bool res = ((ICollection<KeyValuePair<TKey, TValue>>)_dict).Remove(item);
+
+            if (res && CollectionChanged != null)
+                CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item));
+
+            return res;
+        }
+
+        #endregion
+
+        #region IEnumerable
+
+        public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
+        {
+            return _dict.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return ((IEnumerable)_dict).GetEnumerator();
+        }
+
+        #endregion
+    }
+}
diff --git a/RainmeterStudio.sln b/RainmeterStudio.sln
index 7866c990..ff0a6f5a 100644
--- a/RainmeterStudio.sln
+++ b/RainmeterStudio.sln
@@ -72,14 +72,11 @@ EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RainmeterStudio", "RainmeterStudio\RainmeterStudio.csproj", "{438D0136-4A27-4E4D-A617-FFACE4554236}"
 	ProjectSection(ProjectDependencies) = postProject
 		{9A644478-2F1B-4145-8B31-6F8DBD42EC38} = {9A644478-2F1B-4145-8B31-6F8DBD42EC38}
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6} = {E8BD25E9-3055-4688-9E83-ECF684EF30C6}
 		{C641D7F8-DDDC-4EC6-8F5E-233520290642} = {C641D7F8-DDDC-4EC6-8F5E-233520290642}
 	EndProjectSection
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RainmeterStudio.Tests", "RainmeterStudio.Tests\RainmeterStudio.Tests.csproj", "{845F4BD4-6822-4D92-9DDB-15FD18A47E5A}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RainmeterStudio.SkinDesignerPlugin", "RainmeterStudio.SkinDesigner\RainmeterStudio.SkinDesignerPlugin.csproj", "{E8BD25E9-3055-4688-9E83-ECF684EF30C6}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RainmeterStudio.Core", "RainmeterStudio.Core\RainmeterStudio.Core.csproj", "{1D2A4896-AF31-4E82-A84F-4E218067701F}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RainmeterStudio.TextEditorPlugin", "RainmeterStudio.TextEditor\RainmeterStudio.TextEditorPlugin.csproj", "{9A644478-2F1B-4145-8B31-6F8DBD42EC38}"
@@ -532,18 +529,6 @@ Global
 		{845F4BD4-6822-4D92-9DDB-15FD18A47E5A}.Release|Mixed Platforms.Build.0 = Release|Any CPU
 		{845F4BD4-6822-4D92-9DDB-15FD18A47E5A}.Release|Win32.ActiveCfg = Release|Any CPU
 		{845F4BD4-6822-4D92-9DDB-15FD18A47E5A}.Release|x64.ActiveCfg = Release|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Debug|Win32.ActiveCfg = Debug|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Release|Any CPU.Build.0 = Release|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Release|Mixed Platforms.Build.0 = Release|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Release|Win32.ActiveCfg = Release|Any CPU
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6}.Release|x64.ActiveCfg = Release|Any CPU
 		{1D2A4896-AF31-4E82-A84F-4E218067701F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{1D2A4896-AF31-4E82-A84F-4E218067701F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{1D2A4896-AF31-4E82-A84F-4E218067701F}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
@@ -617,6 +602,5 @@ Global
 		{EE8EC522-8430-4B46-86A3-D943D77F9E4B} = {53D952E0-CFD2-4EFF-BAD4-5969E760EFA1}
 		{845F4BD4-6822-4D92-9DDB-15FD18A47E5A} = {8469BE7E-BCDB-4AA8-9541-719E8BFB19A7}
 		{9A644478-2F1B-4145-8B31-6F8DBD42EC38} = {4CCE6052-F43E-4360-B3E2-C046C6C0D86C}
-		{E8BD25E9-3055-4688-9E83-ECF684EF30C6} = {4CCE6052-F43E-4360-B3E2-C046C6C0D86C}
 	EndGlobalSection
 EndGlobal