| 
 | virtual | 
Called by the framework when a button is inserted into a toolbar.
The OnChangeParentWnd function is called by the framework when a button is inserted into a toolbar. This happens, for example, when the user drags a button from one toolbar to another toolbar during customization
The default implementation does nothing.
| pWndParent | Specifies the new parent window. | 
Reimplemented in CBCGPColorMenuButton.