1. 首先要获得IDE的DTE 对象(Get DTE's Object)
if( this._env == null )
{
    Type latestDTE = Type.GetTypeFromProgID("VisualStudio.DTE");
    if( latestDTE == null )
        throw new System.ApplicationException("Can not get DTE Type from VisualStudio.DTE ProgID.");

    this._env = Activator.CreateInstance(latestDTE) as EnvDTE.DTE;
    if( this._env == null )
        throw new System.ApplicationException("Fail to create DTE instance.");
}

2. 增加自己的Tab到Tools Box 里(Add new Tab to Tools Box)
// Get the main window of ToolBox;
Window ToolBoxMainWin;
ToolBoxMainWin = this._env.Windows.Item(EnvDTE.Constants.vsWindowKindToolbox);
if( ToolBoxMainWin == null )
    throw new System.ApplicationException("Can not get the ToolBox window.");

// Get the ToolBox Object
ToolBox TheToolBox;
TheToolBox = (ToolBox) ToolBoxMainWin.Object;

// Get the ToolBox Tab collection
ToolBoxTabs TheToolBoxTab;
TheToolBoxTab = TheToolBox.ToolBoxTabs;

// Check the old tab
ToolBoxTab TheTab = null;
foreach( ToolBoxTab oldTab in TheToolBox.ToolBoxTabs )
{
    if( oldTab.Name != null && oldTab.Name == strTabName )
    {
        TheTab = oldTab;
        break;
    }

}
// Tab is not found, add the new one.
if( TheTab == null )
    TheTab = TheToolBoxTab.Add(strTabName);

if( TheTab == null )
    throw new System.ApplicationException("Adding new ToolBox Tab: " + strTabName + " fails.");

// win bug - need to do this for some reason
this._env.ExecuteCommand("View.PropertiesWindow", "");

3. 把自己的编译好的Assembly 加入到新Tab 中(Add compiled Assembly to the new Tab)

// Active the tab
TheTab.Activate();

// Add Our Components in the Assembly to the tab
TheTab.ToolBoxItems.Add("",
    strAssemblyName,
    vsToolBoxItemFormat.vsToolBoxItemFormatDotNETComponent);

4. 同理,如果要删除自己的控件,则需要在Tab里查询到控件,然后删除,如果发现Tab内没有任何控件也可以选择删除这个Tab(Same concept, if you want delete custmer control from IDE, need search the control first, then delete it , if the Tab don't have any other control, also can choose delete the Tab)

// tab item count is 1(pointer) or no item name specified, delete the tab immediately
if( theTab.ToolBoxItems.Count == 1 || toolBoxItemNames == null || toolBoxItemNames.Length == 0 )
    theTab.Delete();
else                            
{
    // Remove the items
    ToolBoxItem OldItem;
    System.Collections.ArrayList deleteItems = new System.Collections.ArrayList();
    bool[] deletedIndex = new bool[toolBoxItemNames.Length];
    for( int i = 0; i < toolBoxItemNames.Length; i++ )
        deletedIndex[i] = false;

    System.Collections.IEnumerator ItemEnum = theTab.ToolBoxItems.GetEnumerator();
    ItemEnum.Reset();
    while( ItemEnum.MoveNext() )
    {
        OldItem = (ToolBoxItem)ItemEnum.Current;
        bool itemFound = false;

        if( OldItem != null )
        {
            for(int i = 0; i < toolBoxItemNames.Length; i++)
            {
                if( deletedIndex[i] )
                    continue;

                if( toolBoxItemNames[i] == null && OldItem.Name == null )
                {
                    itemFound = true;
                    deletedIndex[i] = true;
                    break;
                }
                
                if( toolBoxItemNames[i] != null && OldItem.Name != null && toolBoxItemNames[i] == OldItem.Name )
                {
                    itemFound = true;
                    deletedIndex[i] = true;
                    break;
                }
            }
        }
        if(!itemFound)
            continue;

        deleteItems.Add(OldItem);
    }
    if( deleteItems.Count == ( theTab.ToolBoxItems.Count - 1) ) // delete item == toolitems -1 (pointer), delete the tab directly.
        theTab.Delete();
    else
    {
        for( int i = 0; i < deleteItems.Count; i++ )
        {
            OldItem = (ToolBoxItem)deleteItems[i];
            // delete the item.
            OldItem.Delete();                            
        }
        if( theTab.ToolBoxItems.Count == 1 )
            theTab.Delete();
        // checked undeleted items.
        if( deleteItems.Count != toolBoxItemNames.Length )
        {
            string undeletedNames = "";
            bool first = true;

            for( int i = 0; i < toolBoxItemNames.Length; i++ )
            {
                if( deletedIndex[i] )
                    continue;
                if( first )
                {
                    undeletedNames = undeletedNames + toolBoxItemNames[i];
                    first = false;
                }
                else
                    undeletedNames = undeletedNames + "," + toolBoxItemNames[i];

            }

            throw new System.ApplicationException("Fail to remove item: " + undeletedNames + ".");
        }
    }
}