Method XbpTreeViewItem():delItem() Foundation
Deletes an item from a sub-level.
:delItem( <oItem> ) --> oItem | NIL
This method returns the XbpTreeViewItem object removed from the list of sub-items. If the object is not removed, the return value is NIL.
This method removes an XbpTreeViewItem object that has been added as sub-item with the :addItem() method. This way the structure of a tree view can be dynamically changed.
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