在Ext.grid.PropertyGrid的listeners中加入以下代码：
SqlList为cmbox的属性行的id
SqlListCombo为下拉框的id
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afteredit: function(o){
???? ??if('SqlList' == o.record.id){
???? ???var combo = Ext.getCmp('SqlListCombo');
???? ???var record = combo.findRecord(combo.valueField, o.value);
??????? ???var src = propertyGrid.getSource();
??????? ???src['SqlList'] = record.get(combo.displayField);
??????? ???propertyGrid.setSource(src);
???? ??}
}
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