I'm using the 'Blue Flat' theme in a cn1 project, and the checkboxes in a MultiButton component (I suppose following the Button text color) are completely white, making them invisible on a white background. I've tried changing their foreground color in the theme (in the GUI Builder theme tab), I tried replacing the theme files with checkboxes of a darker shade, but nothing seems to affect it.
How can I make the MultiButton checkbox a different color?
The blue theme customizes the checkbox image theme constant which you can remove at which case it should derive theme colors:
https://www.codenameone.com/manual/advanced-theming.html#_theme_constants
Just select the constants tab in the theme and remove the ones relevant to the checkbox.
来源：https://stackoverflow.com/questions/37796869/codenameone-change-color-of-checkbox-in-theme