+// we will have a mouseDown, then in the native
+// implementation of mouseDown the tracking code
+// is calling clickedAction, therefore we wire this
+// to thumbtrack and only after super mouseDown
+// returns we will call the thumbrelease
+
+void wxSliderCocoaImpl::controlAction( WXWidget WXUNUSED(slf), void *WXUNUSED(_cmd), void *WXUNUSED(sender))