根据datagrid中checkbox的选中情况将数据添加到collection中

<fx:Component>
<CheckboxItemRanderer:CheckboxItemRanderer paddingLeft="10" change="{outerDocument.checkBoxChange(data as Object,this)}"/>
</fx:Component>

//将勾选的记录添加到selectItems，将去除勾选的记录从selectItems中剔除

public function checkBoxChange(obj:Object,check:CheckBox):void {

if(check.selected) {

selectItems.push(obj);

} else {

for(var i:int=0; i<selectItems.length; i++) {

if(selectItems[i] == obj) {

selectItems.splice(i,1);

}

}

}

}