<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/03/04/dynamically-adding-new-columns-to-a-datagrid-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
		layout="vertical"
		verticalAlign="middle"
		backgroundColor="white" viewSourceURL="srcview/index.html">

	<mx:Script>
		<![CDATA[
			import mx.controls.dataGridClasses.DataGridColumn;

			private function addDataGridColumn(dataField:String):void {
				var dgc:DataGridColumn = new DataGridColumn(dataField);
				var cols:Array = dataGrid.columns;
				cols.push(dgc);
				dataGrid.columns = cols;
			}

			private function init():void {
				addDataGridColumn("col4");
			}
		]]>
	</mx:Script>

	<mx:ArrayCollection id="arrColl">
		<mx:source>
			<mx:Array>
				<mx:Object col1="A.1" col2="A.2" col3="A.3" col4="A.4" />
				<mx:Object col1="B.1" col2="B.2" col3="B.3" col4="B.4" />
				<mx:Object col1="C.1" col2="C.2" col3="C.3" col4="C.4" />
				<mx:Object col1="D.1" col2="D.2" col3="D.3" col4="D.4" />
				<mx:Object col1="E.1" col2="E.2" col3="E.3" col4="E.4" />
				<mx:Object col1="F.1" col2="F.2" col3="F.3" col4="F.4" />
			</mx:Array>
		</mx:source>
	</mx:ArrayCollection>

	<mx:ApplicationControlBar dock="true">
		<mx:Button click="init();" />
	</mx:ApplicationControlBar>

	<mx:DataGrid id="dataGrid"
			dataProvider="{arrColl}"
			width="400"
			rowCount="6">
		<mx:columns>
			<mx:DataGridColumn dataField="col1" />
			<mx:DataGridColumn dataField="col2" />
			<mx:DataGridColumn dataField="col3" />
		</mx:columns>
	</mx:DataGrid>

</mx:Application>

