[Users] RadioButtonMixin and custom TreeNodeUI

[Dan Ramage]

Is the RadioButtonMixin class currently being used in the latest release?
I've been trying to understand how to create a tree node with a slider for
opacity, so I've been looking at how the radio button was implemented. The
example I originally followed simply added the radioGroup: 'foo' to the
loader configuration when building the nodes. The only place I could find
radioGroup referenced was the RadioButtonMixin, but I can't seem to find
where/how RadioButtonMixin is instantiated.


Thanks for any pointers,


Dan