code: function () {
  		var c$ = this.$.client.children;
  		var c;
  		for (var i = c$.length - 1; (c = c$[i]); i--) {
  			if (!c.unmoveable) {
  				return c;
  			} else {
  				if (c.toolbarIndex===undefined) {
  					c.toolbarIndex = i;
  				}
  			}
  		}
  	}
docs: Finds the next control (starting from the end) that can be pushed onto the menu.
  
  @private