Thank you! It works...
Are you saying that you only want the UltraCheckEditor to pick up the application styling if its Style is set to Button? What you could do is create a new StyleSet within AppStylist for each type, then set the StyleSetName property on the UltraCheckEditor accordingly. So you would create a StyleSet named, for instance, "CheckButtonStyle" and another named "CheckStyle" within AppStylist. If you don't want to do any styling on regular checkboxes, you could just assign the button-style editors the StyleSetName. I don't think that there's any way to specifically only apply a style to a Button-styled UltraCheckEditor from within AppStylist, though.
-Matt