I am trying to achieve a somewhat simple thing but it turns out to be more convoluted than expected: Get ToolbarToggle to behave like a radio button, much like what you can on see the lighting window. I do register ChangeEvent<bool> since MouseDownEvent does not work, then on that unified callback I do negate value without notifying for other toggles in the toolbar. This works fine except that you can un-toggle one of them ... this is because base class Toggle adds a manipulator which will negate value on click. I was hoping to solve that relatively easily, that is, without having to roll-out my own control just to shortcut this behavior. Any ideas? Thanks!