May be I am the only one having trouble with it but I found an inconsistency in the user interface. When I edit a button in the data grid I have under Appearance first Image then the option Caption. When I edit a button in the control bar of a datagrid I have under Appearance first the option Caption and then Image. Because of this inconsistency I always click the wrong one. I assume that Caption should be on top, because that is the most logical one to appear first. Should I file a bug report or an enhancement request?
I think Caption should be on top of image. But note that you can easily change the Caption by clicking on the button and directly start with typing. So you specify your caption without clicking on Caption in the appearances.