extjs RadioGroup 的设值 和取值
Ext.override(Ext.form.RadioGroup, { getValue : function() { var v; this.items.each(function(item) { if (item.getValue()) { v = item.getRawValue(); return false;}});return v;},setValue : function(v) {if (this.rendered) {this.items.each(function(item) {item.setValue(item.inputValue == v);});} else {for (var k in this.items) {this.items[k].checked = this.items[k].inputValue == v;}}}});