Navigates to the inputed action's path.
        
        :param      action | <QAction>

def navigateToIndex( self, index ):
        """
        Navigates to the inputed action's path.
        
        :param      action | <QAction>
        """
        self._completerTree.hide()
        item = self._navigationModel.itemFromIndex(index)
        self.setText(self._navigationModel.itemPath(item))