You'd just change the TargetControlID to point to your asp:checkbox control...
If you want to add/remove/change icons on the buttons, you can do so through css/javascript.
If you'd like to hook up a third party jquery ui widget to juice ui, have a look at how the widgets are wired up in the Juice UI source code on github, or the Wijmo Open for Juice UI source code. Alternately, you can contract appendTo to do that for you as a consulting job.