Datagrid item renderer delete button

I have a datagrid with an item renderer.  In the item renderer is a delete 
button img.  Onclick it will remove the item from the datagrid with the 
exception of the first item.  I am using outer document to call my function but 
when I do I get an error that says Attempt access of inaccessible method 
deleteContact through a reference with static type myTitleWindowContact?

 private function deleteContact(event:Event,data:*):void{
 	if (contactData.selectedIndex >= 1) {
 	caseVO.acCont.removeItemAt(contactData.selectedIndex);
 	 }
  }

 <mx:DataGrid dataProvider="{model.currentVO.acCont}" 
 	id="contactData" 
 	width="651" 
 	height="117" 
 	click="showForm()" >
 		<mx:columns>
 		 <mx:DataGridColumn editable="false" width="5">
 		        	<mx:itemRenderer>
 		        		<mx:Component>
 		        			<mx:HBox width="100%" height="15" horizontalAlign="center" 
verticalAlign="middle">
 		        				<mx:Button 
 		        
					icon="@Embed(source='/com/serg/reportingTool/assets/images/delete.png')"
 		        					click="outerDocument.deleteContact(event,data)" 
 		        					label="D" 
 		        					toolTip="Delete" 
 		        					width="15"
 		        					height="15"
 		        					/>
 		        			</mx:HBox>
 		        		</mx:Component>
 		        	</mx:itemRenderer>
 		        </mx:DataGridColumn>

Make your function public.

 <?xml version="1.0"?>
 <mx:Application xmlns:mx=" http://www.**--****.com/ ">    
     <mx:Script>
         <![CDATA[
             import mx.collections.ArrayCollection;
         
             [Bindable]                        
             private var initDG:ArrayCollection = new ArrayCollection([
                 { Header:'Test Header'}
             ]);
             
 			public function printString():String{
 				return "I'm inside the renderer!!!";
 			}            
         ]]>
     </mx:Script>
     <mx:DataGrid id="myGrid" dataProvider="{initDG}" width="100%" 
variableRowHeight="true">   
         <mx:columns>
             <mx:DataGridColumn dataField="Header">
                 <mx:itemRenderer>
                   <mx:Component>
                     <mx:VBox>
                          <mx:TextArea 
                            text="{outerDocument.printString()}"/>
                     </mx:VBox>
                   </mx:Component>
                 </mx:itemRenderer>
             </mx:DataGridColumn>    
         </mx:columns>       
     </mx:DataGrid>      
 </mx:Application>