Method XbpTreeViewItem():expand() Foundation
Displays or hides sub-items of an XbpTreeViewItem object.
:expand( <lExpand> ) --> lSuccess
This method returns .T. (true) when the display state of sub-items has changed, otherwise it returns .F. (false).
The method :expand() is used to explicitly display (expand) or hide (collapse) sub-levels in a tree view. This way, the initial state of a tree view can be defined exactly, for example.
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