[ex.image]

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
	<mx:Script>
		<![CDATA[
			import mx.controls.dataGridClasses.DataGridColumn;
			private function addNewColumn(name:String):void
			{
				var newColumn:DataGridColumn = new DataGridColumn(name)
				var columnArray:Array = grid.columns
				columnArray.push(newColumn)
				grid.columns = columnArray
			}
		]]>
	</mx:Script>
	<mx:Button label="Button" click="addNewColumn(columnName.text)" left="10" top="10" height="22" width="160"/>
	<mx:DataGrid id="grid" right="7" left="178" top="11">
		<mx:columns>
			<mx:DataGridColumn headerText="Column 1" dataField="col1"/>
			<mx:DataGridColumn headerText="Column 2" dataField="col2"/>
			<mx:DataGridColumn headerText="Column 3" dataField="col3"/>
		</mx:columns>
	</mx:DataGrid>
	<mx:TextInput id="columnName" text="MyNewColumn" left="10" top="40" width="160"/>

</mx:Application>