====== behavior: clickable ======
Clickable is the element that will generate BUTTON_CLICK and BUTTON_PRESS events but is not normally "TAB traversable".
That is typical behavior of toolbar buttons. 

===== Elements =====
There are no elements that have this behavior applied by default.

===== Attributes =====
It does not use any specific attributes other than common attributes like ''disabled'' or ''id''.


===== Events =====
Together with the standard set of events (mouse, keyboard, focus) it generates:
    *  BUTTON_CLICK event - mouse down/up or ''spacebar'' key click when button is in focus. Posted (asynchronous) event
    *  BUTTON_PRESS event - mouse down or ''spacebar'' key down when button is in focus. Synchronous event.