I am working on CMS 12 and am trying to add a custom toolbar button for a checkmark bulleted list.  I want all the same functionality of the standard unordered list button, only they want the bullet to be a checkmark image.  I've been able to create the plugin successfully and have it showing in the toolbar and functioning at a basic level.  Is there a way to tie my new button into all the existing logic that exists for the normal bulllist button?  Has anyone out there successfully created a custom icon bulleted list button out there and have it execute all the necessary logic?  I am not super-experienced with Dojo, so may be missing something to make it easier.