Actionscript 3 :: Change Headers On A Datagrid In Flash

I have been trying to customize the datagrid component. So far I have been able to customize the cells using a custom cellRenderer. I would like to change the way the header looks by using a custom headerRenderer as well but from all the ones that I have tried to make don't work.[code]to try and set the headerRenderer class that I created to the datagrid name dgPL. But it doesn't work. From what I have found on the internet the headerRenderer class is suppose to act just like the cellRenderer class in design and implementation. I can't find any examples of people using a custom headerRenderer class or examples on how to make one.I have gone wrong in designing my class or implementing it into my program would be appreciated.Also I am trying to figure out how to add a Marquee to the cells of the same datagrid so that if the content in the cell is too long for the size of the cell it will scroll across the cell when the user rolls over the datagids list of content. The part I am having trouble with is figuring out how to get the new string assigned to the cell without permanently overriding the dataprovider's content for that specific row in the datagrid.

From my looking on the internet I have found a way to create a marquee for textFields. What I can't figure out is how to apply it to the datagrid itself.[code]Right now the marquee works by creating a textField and doing the marquee that way but that isn't the most effective way of doing it at all due to allignment issues when scrolling the content in the datagrid.I know how the Marquee works I just don't see how to apply this marquee to the datagrid cells itself. I know how to grab the content of my cell's with no issues at all and how to redefine it for the marquee to work I just am not sure how to assign it back to the cell itself without overriding the dataprovider permanently.