I as well am trying to implement the WinTree in a right to left fashion.  When using a standard TreeView to get the tree to display in a right to left fashion you need to mirror the control.  The code to do this looks like this:

protected override CreateParams CreateParams
        {
            get
            {
                CreateParams CP;
                CP = base.CreateParams;
                if(_mirrored)
                    CP.ExStyle = CP.ExStyle | WS_EX_LAYOUTRTL | WS_EX_NOINHERITLAYOUT;
                return CP;
            }
        }

This works perfectly with the TreeView, However with the WinTree the text is painted in reverse as if it was flipped.

Is there a way to override this behavior?