Hi Judah, If you are on Flex 3 SDK, you can just use your own skin for mx:Datagrid header called "headerBackgroundSkin" http://livedocs.adobe.com/flex/3/langref/mx/controls/DataGrid.html#styleSummary
It is only available in Flex 3 SDK, I learned it from source file of mx.controls.dataGridClasses.DataGridHeader from Flex 3 SDK. Otherwise, override protected "drawHeaderBackground" method for mx:Datagrid for Flex 2 SDK as described here: http://www.munkiihouse.com/?p=14 -- Med venlig hilsen / Best regards Andriy Panas [EMAIL PROTECTED]