Add wxTreeCtrl::{Clear,Set}FocusedItem().

Allow changing just the currently focused (not selected) item and also
removing the focus completely.

Closes #11599.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64196 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/treectrl.h

@@ -214,6 +214,13 @@ public:
         // equivalent to GetSelection() if not wxTR_MULTIPLE
     virtual wxTreeItemId GetFocusedItem() const = 0;
 
+
+        // Clears the currently focused item
+    virtual void ClearFocusedItem() = 0;
+        // Sets the currently focused item. Item should be valid
+    virtual void SetFocusedItem(const wxTreeItemId& item) = 0;
+
+
         // get the parent of this item (may return NULL if root)
     virtual wxTreeItemId GetItemParent(const wxTreeItemId& item) const = 0;