function(className, force){
        if (typeof force !== 'boolean') {
            force = !this.hasCls(className);
        }

   		return (force) ? this.addCls(className) : this.removeCls(className);
   	}
function(className, force){
        if (typeof force !== 'boolean') {
            force = !this.hasCls(className);
        }

   		return (force) ? this.addCls(className) : this.removeCls(className);
   	}
function ( className , force ) { if ( typeof force !== 'boolean' ) { force = ! this . hasCls ( className ) ; } return ( force ) ? this . addCls ( className ) : this . removeCls ( className ) ; }
Toggles the specified CSS class on this element (removes it if it already exists, otherwise adds it).
@param {String} className The CSS class to toggle.
@return {Ext.dom.Element} this
Toggles the specified CSS class on this element ( removes it if it already exists otherwise adds it ) .