Border blanking in Workbench

[fragment]

Hi,

Here's my problem.. I'd like to get rid of the grey border around the WB window without changing the palette.

There are numerous utils in Aminet which do this and I've tried many of them but none of them work with my internal scandoubler (DCE FlickerMagic). The border goes black on for example on the composite output, but not on the VGA..

My machine is an A1200 with OS3.9+BB2.

So, any ideas, fellow scandoubler users, or are we all dooooooomed?  :-D

[fragment]

The border blanking option in MCP is one I have already tried.

This picture shows how the border blankers work on the composite output, but not on the VGA.