dlgitem_is_expanded
dlgitem_is_expanded (window, listtag, row)
Returns true if the tree node (specified by listtag) has children and the children are expanded. Otherwise, returns false.
• window — The window identifier of the window containing the tree.
• listtag — The list tag (identifier of the node) of the tree branch.
• row — The index of the tree node in the tree branch.