Thx, the first suggestion works perfect.

Can't use the GlyphInfo, since we are stuck with v7.2 for the moment being...

Yes. Put an UltraCheckEditor control on the form with the grid and do the same thing I described above - set the Style to Custom and apply images to the CheckedAppearance (for checked) and Appearance (for unchecked). Then set the grid's Column's EditorControl property to the UltraCheckEditor.

If you are using v8.2, you have even more control using the new GlyphInfo feature. Instead of setting the CheckBox Style to custom, just go to the GlyphInfo property and you can edit the checkbox images inevery possible state.

 Can the same thing be done in an UltraGrid with a checkbox column?

Oh right.. the easy way.  I just assumed everyone wanted to do it the hard way.

Actually... there is a much easier way. Simply set the Style of the Control to Custom. Then specify the Image property on the Appearance (for unchecked) and CheckAppearance (for checked).