These places generally correspond to the events that the object can detect and that you can respond to. (The lone exception is the Quick Action, which is essentially a simpler version of the On Click event.)
It looks like this button object has five places where actions can be defined:
· Quick Action, which is where you can choose from a list of the most common responses to a mouse click on the object and "program" it using a streamlined configuration interface
· On Click, which is triggered when you click on the button
· On Right-Click, which is triggered when you right-click on the button
· On Enter, which is triggered when the mouse moves onto the button (when the mouse pointer enters into the objects space)
· On Leave, which is triggered when the mouse moves off of the button (when the mouse pointer leaves the objects space)
Note: Any transparent parts of the object are ignored as far as On Enter and On Leave are concerned. The mouse has to actually enter or leave a non-transparent part of the button for the event to be triggered.