Flex DataGrids in Workspace



I have a Flex form (SWF), which contains a DataGrid. When used outside of workspace, the DataGrid looks perfect. However, access the form from within Workspace, the DataGrid is missing all it's vertical lines separating the columns (other than header row)

Even when I stuff the DataGrid with data, only the header row shows vertical lines.

I though it could be a sizing issue, but using the SWF externally at all different sizes still displays the DataGrid perfectly.

Anyone have an idea why this would be?