The Objective Toolkit tree control supports a number of notifications messages sent in the form of a WM_NOTIFY message.
| Notification | Description |
| TVN_BEGINDRAG | Notifies a tree view control's parent window that a drag-and-drop operation involving the left mouse button is being initiated. |
| TVN_BEGINLABELEDIT | Notifies a tree view control's parent window about the start of label editing for an item. |
| TVN_ENDLABELEDIT | Notifies a tree view control's parent window about the end of label editing for an item. |
| TVN_ITEMEXPANDED | Notifies a tree view control's parent window that a parent item's list of child items has expanded or collapsed. |
| TVN_ITEMEXPANDING | Notifies a tree view control's parent window that a parent item's list of child items is about to expand or collapse. |
| TVN_SELCHANGED | Notifies a tree view control's parent window that the selection has changed from one item to another. |
| TVN_SELCHANGING | Notifies a tree view control's parent window that the selection is about to change from one item to another. |
| TVN_SETDISPINFO | Notifies a tree view control's parent window that it must update the information it maintains about an item. |
| TVN_GETDISPINFO | Requests that a tree view control's parent window provide information needed to display or sort an item. |
| TVN_KEYDOWN | Notifies a tree view control's parent window that the user pressed a key and the tree view control has the input focus. |
| TVN_DELETEITEM | Notifies a tree view control's parent window that an item is being deleted. |
| TVN_BEGINLABELEDIT | Notifies a tree view control's parent window about the start of label editing for an item. |
| LVN_BEGINLABELEDIT | Notifies a list view control's parent window about the start of label editing for an item. |
| LVN_DELETEITEM | Notifies a list view control's parent window that an item is about to be deleted. |
| LVN_ENDLABELEDIT | Notifies a list view control's parent window about the end of label editing for an item. |
| LVN_GETDISPINFO | Sent by a list view control to its parent window. It is a request for the parent window to provide information needed to display or sort a list view item. |
| LVN_INSERTITEM | Notifies a list view control's parent window that a new item was inserted. |
| LVN_KEYDOWN | Notifies a list view control's parent window that a key has been pressed. |
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