DataGrid的DataGridColumn内部如何调用外部method

<?xml version="1.0" encoding="utf-8"?>
<mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:tenant="dps.component.tenant.*" width="100%" height="100%" headerHeight="0" initialize="init()">
<mx:Script source="../../../DPSImage.as"/>
<mx:Script>
<!--[CDATA[
import mx.events.EffectEvent;
import mx.effects.Fade;
import mx.events.DynamicEvent;
import dps.model.GlobalEmployeeEntityBean;
import dps.model.GlobalTenantEntityBean;
import dps.control.TenantControl;
import mx.collections.ArrayCollection;
import mx.managers.PopUpManager;
import mx.controls.Alert;
import mx.core.Application;
import dps.core.util.DateUtil;
[Bindable]
private var tenantInfo:ArrayCollection = new ArrayCollection( );
private var isPendingView:Boolean = true;
public function init():void
{
TenantControl.getInstance().getTenantList(callback);
function callback(data:ArrayCollection):void
{
tenantInfo = data;

}
}
public function editTenant(data:GlobalTenantEntityBean):void
{
var addTenant:TenantAddView = TenantAddView(PopUpManager.createPopUp(Application.application as DisplayObject,TenantAddView,true));
addTenant.globalTenantEntityBean = data as GlobalTenantEntityBean;
addTenant.addEventListener("UPDATE",refresh)
PopUpManager.centerPopUp(addTenant);
}
public function refresh(event:DynamicEvent=null):void
{
init();
}
private function tpLabelFunction(item:Object, column:DataGridColumn):String
{
var globalTenantEntityBean:GlobalTenantEntityBean = item as GlobalTenantEntityBean;
var strTp:String = "";
if(globalTenantEntityBean.topManagers != null){
for(var j:int = 0; j<globalTenantEntityBean.topManagers.length; j++){
strTp += GlobalEmployeeEntityBean((globalTenantEntityBean.topManagers)[j]).notesId + ',';
}
return strTp.substr(0,strTp.length-1);
}else{
return "";
}
}
private function taLabelFunction(item:Object, column:DataGridColumn):String
{
var globalTenantEntityBean:GlobalTenantEntityBean = item as GlobalTenantEntityBean;
var strTa:String = "";
if(globalTenantEntityBean.tenantAdmins != null){
for(var k:int = 0; k<globalTenantEntityBean.tenantAdmins.length; k++){
strTa += GlobalEmployeeEntityBean((globalTenantEntityBean.tenantAdmins)[k]).notesId + ',';
}

return strTa.substr(0,strTa.length-1);
}else{
return "";
}
}
private function labelFunction(item:Object, column:DataGridColumn):String
{
var globalTenantEntityBean:GlobalTenantEntityBean = item as GlobalTenantEntityBean;
var strTa:String = "";
if(globalTenantEntityBean.contractStartDate != null&&globalTenantEntityBean.contractEndDate!=null)
{
strTa = globalTenantEntityBean.contractStartDate+"~"+globalTenantEntityBean.contractEndDate;
return strTa.substr(0,strTa.length-1);
}else{
return "";
}
}
public function changeViewClick():void
{
if(isPendingView)
{
lbl.text = "Role Management";
link.label = "Tenant Management";
}
else
{
lbl.text = "Tenant Management";
link.label = "Role Management";
}
changeView();
}
public function changeView():void
{
var fa:Fade = new Fade();
if(isPendingView)
{
fa.target = tenantV;
}
else
{
fa.target = roleV;
}
fa.alphaTo = 0;
fa.addEventListener(EffectEvent.EFFECT_END,effectEndFunction);
fa.play();
function effectEndFunction(evt:EffectEvent):void
{

var fade:Fade = new Fade();
if(isPendingView)
{
tenantV.visible = false;
tenantV.setStyle("alpha",0);
fade.target = roleV;
roleV.visible = true;

}
else
{
roleV.visible = false;
roleV.setStyle("alpha",0);
fade.target = tenantV;
tenantV.visible = true;
}
isPendingView = !isPendingView;
fade.alphaFrom = 0;
fade.alphaTo = 1;
fade.play();
}
}
]]>
</mx:Script>
<mx:Canvas width="100%" height="100%">
<mx:Canvas width="100%" height="100%">
<mx:Panel width="100%" height="100%">
<mx:DataGrid id="tenantV" width="100%"  height="100%" dataProvider="{tenantInfo}">
<mx:columns>
<mx:DataGridColumn headerText="Tenant Name" dataField="tanentName"/>
<mx:DataGridColumn headerText="Top Manager" labelFunction="tpLabelFunction" />
<mx:DataGridColumn headerText="Tenant Admin" labelFunction="taLabelFunction"/>
<mx:DataGridColumn headerText="Package" dataField="rentFuncPacks" />
<mx:DataGridColumn headerText="Contract Period" labelFunction="labelFunction"/>
<mx:DataGridColumn headerText="Tenant Status" dataField="tenantStatus"/>
<mx:DataGridColumn headerText="Description" dataField="description" sortable="false"/>
<mx:DataGridColumn width="60">
<mx:itemRenderer>
<mx:Component>
<mx:HBox horizontalAlign="center" verticalAlign="middle" width="100%" height="100%">
<mx:Script source="../../../DPSImage.as"/>
<mx:Script>
<![CDATA[
import dps.model.GlobalTenantEntityBean;
import mx.events.DynamicEvent;
import mx.managers.PopUpManager;
import mx.core.Application;
import dps.constant.Globalization;
private function editItem(evt:MouseEvent):void
{

(outerDocument as TenantView).editTenant(data as GlobalTenantEntityBean);
/*var addTenant:TenantAddView = TenantAddView(PopUpManager.createPopUp(Application.application as DisplayObject,TenantAddView,true));
addTenant.globalTenantEntityBean = data as GlobalTenantEntityBean;
PopUpManager.centerPopUp(addTenant);*/
}
]]-->
</mx:Script>
<mx:Image source="{editIcon}" buttonMode="true" toolTip="{Globalization.EDIT}" click="editItem(event)"/>
</mx:HBox>
</mx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
</mx:columns>
</mx:DataGrid>
</mx:Panel>
<tenant:RoleManagementView width="100%" height="100%" visible="false" id="roleV"/>
</mx:Canvas>
<mx:HBox width="100%" verticalAlign="middle" borderStyle="solid" cornerRadius="5" height="30" backgroundColor="#FEE6AD"  paddingLeft="5" paddingRight="5">
<mx:Label text="Tenant Management" fontWeight="bold" id="lbl" width="130"/>
<mx:VRule height="20"/>
<mx:LinkButton label="Role Management" id="link" styleName="blueLink" click="changeViewClick()"/>
<mx:Spacer width="100%"/>
</mx:HBox>
</mx:Canvas>
</mx:Panel>