Answer
To launch the custom action the "DoAction" published control event must be used.
Switch to the Custom Actions page.
Define the custom action that will be executed under the “UI Custom Actions” section.
Go to the Dialog Editor page. Select the button that will trigger the execution
of the custom action.
Select the “Published Events” tab from the “Control” pane.
Use the button to create a new control event. The Edit Control Events Dialog will be displayed.
Configure the control event as follows:
- Name = DoAction
- Argument = Select the name of the custom action that you created earlier.
- Condition = Leave this field unchanged if you don't want to condition the execution of this control event.