TVM_EXPAND Overview  Group

The TVM_EXPAND message expands or collapses the list of child items, if any, associated with the specified parent item. You can send this message explicitly or by using the TreeView_Expand macro.

TVM_EXPAND 

wParam = (WPARAM) (UINT) flag; 

lParam = (LPARAM) (HTREEITEM) hitem; 

 

Parameters

flag

Action flag. This parameter can be one of the following values:

Value	Meaning
TVE_COLLAPSE	Collapses the list.
TVE_COLLAPSERESET	Collapses the list and removes the child items. Note that TVE_COLLAPSE must also be specified.
TVE_EXPAND	Expands the list.
TVE_TOGGLE	Collapses the list if it is currently expanded or expands it if it is currently collapsed.

hitem

Handle to the parent item to expand or collapse.

Return Values

Returns TRUE if any change took place or FALSE otherwise.

Remarks

This message does not send the TVN_ITEMEXPANDING and TVN_ITEMEXPANDED notification messages to the parent window.

See Also

TreeView_Expand, TVN_ITEMEXPANDED, TVN_ITEMEXPANDING