Keeping border doesn't work if corners are not all the same

[wardepartment]

I am creating bordered buttons that have three rounded corners and one beveled.

(etc) $(this).corner("round 3px").corner("bevel br");

If I try to keep the border for the entire button:

$(this).corner("round 3px keep").corner("bevel br keep");

the bottom right beveled corner takes on the rounded border, and not the beveled one.

I also tried:
$(this).corner("round 3px tl keep").corner("round 3px tr keep").corner("round 3px bl keep").corner("bevel br keep");

but the beveled corner still has a rounded border.

Thanks for all your hard work!