add: this.setFocus(true); 
context:     _buttonClickListener: function(event) {        if (!this._enabled || this._ddComp == null) return;                if (!this._ddComp.isVisible()) {            this.setDropDownVisible(true);        } else {            this.setDropDownVisible(false);        }    },
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/08678d7dea9b1128e89dae68c0cc8da8c8dec68c/DropDown.js/buggy/src/thinwire/render/web/resources/DropDown.js