I've added the ability for a UIA control to expand or collapse any child item (that implements the ExpandCollapsePattern. This allows you to use a SelectList with a TreeView control, since TreeView items implement the SelectionPattern and its children implement SelectionItemPattern just as a ComboBox control does.
At some point it might make sense to make a specific TreeView control that derives from SelectList, but currently SelectList has methods specific to a ComboBox control (#list_item_height, #scroll_to_item, #get_top_index, etc.).
I've added the ability for a UIA control to expand or collapse any child item (that implements the
ExpandCollapsePattern. This allows you to use aSelectListwith aTreeViewcontrol, sinceTreeViewitems implement theSelectionPatternand its children implementSelectionItemPatternjust as aComboBoxcontrol does.At some point it might make sense to make a specific
TreeViewcontrol that derives fromSelectList, but currentlySelectListhas methods specific to aComboBoxcontrol (#list_item_height,#scroll_to_item,#get_top_index, etc.).