Convert Thumbnail Square Corners To Round?

[jimhanus]

I have a website with many thumbnails: each is a rectangle with square corners, bitmap fill, and a shadow. Is there a way to easily round the corners without making each one over again? I can't seem to find a way without remaking all of them.
Thanks!

Jim

[zaphodeist]

Select with the Rectangle Tool and click the rounded corners button on the info bar

[jimhanus]

When I do that, none of the options are available. Plus, there is no "Curvature" option in the list.

[zaphodeist]

The curvature button doesn't appear to be depressed in your image Jim

[jimhanus]

Sorry, I updated the attachment to show that it is. Same problem.

[glenngosack]

when you select one of the objects, does it say rectangle or shape on the lower left corner of Xara?... if it says shape, the rounded corner option won't have any effect... it only works on rectangles.