protected function _listScreens($screenType)
    {
        $screenClass = $this->_getScreenClass($screenType);
        $paths       = $this->_getScreenDirs($screenType);

        return $this->listClasses($screenClass, $paths, 'getScreenLabel');
    }
protected function _listScreens($screenType)
    {
        $screenClass = $this->_getScreenClass($screenType);
        $paths       = $this->_getScreenDirs($screenType);

        return $this->listClasses($screenClass, $paths, 'getScreenLabel');
    }
protected function _listScreens ( $ screenType ) { $ screenClass = $ this -> _getScreenClass ( $ screenType ) ; $ paths = $ this -> _getScreenDirs ( $ screenType ) ; return $ this -> listClasses ( $ screenClass , $ paths , 'getScreenLabel' ) ; }
Returns a list of selectable screens with an empty element as the first option.

@param string $screenType The type (i.e. lookup directory with an associated class) of the screens to list
@return \Gems_tracker_TrackerEventInterface or more specific a $screenClass type object
Returns a list of selectable screens with an empty element as the first option .