rainmeter-studio/RainmeterStudio/Documents/DocumentEditorFeatures/IToolboxProvider.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace RainmeterStudio.Documents.DocumentEditorFeatures
{
    public interface IToolboxProvider
    {
        bool SupportsToolboxDrop { get; }
        IEnumerable<string> ToolboxItems { get; }

        event EventHandler ToolboxItemsChanged;
    }
}