Trigger Events: Use the attribute Trigger Events in the Attributes Panel to define which button of a form associated to the element triggers the default process flow of a BPMN process. This attribute is only available for boundary events.
On Exit: Input message (define the corresponding type of message in your own Library or Data Model class).
Editing and Styling
Go to Working with the BPMN Editor for further information regarding editing of BPMN elements using the different context menus on the diagram pane.
Go to Styling BPMN Elements for further information regarding styling possibilities for BPMN elements, for example how to change the background color, the font style and size etc.