added wxTreeCtrl::UnselectItem() and ToggleItemSelection() (includes patch 832281)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@25714 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/treectrl.h

@@ -317,7 +317,12 @@ public:
         // unselect all items (only makes sense for multiple selection control)
     void UnselectAll();
         // select this item
-    void SelectItem(const wxTreeItemId& item);
+    void SelectItem(const wxTreeItemId& item, bool select = true);
+        // unselect this item
+    void UnselectItem(const wxTreeItemId& item);
+        // toggle item selection
+    void ToggleItemSelection(const wxTreeItemId& item);
+
         // make sure this item is visible (expanding the parent item and/or
         // scrolling to this item if necessary)
     void EnsureVisible(const wxTreeItemId& item);