combobox除了光标

combobox去除光标
listeners     : {
    'expand'   : function(combo) {
        var blurField = function(el) {
            el.blur();
        }
        blurField.defer(10,this,[combo.el]);
    },
    'collapse'   : function(combo) {
        var blurField = function(el) {
            el.blur();
        }
        blurField.defer(10,this,[combo.el]);
    }
}



原文：http://www.sencha.com/forum/showthread.php?83780-Remove-the-cursor-from-a-combobox