You can define a function that is triggered by a form or control event or modify an existing function.
To define or modify a form or control trigger
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Open the form in the Form Designer.
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Select the form or the control (or menu item) and click View and then click C/AL Code (F9) to open the C/AL Editor.
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In the editor, you have access to the triggers that apply to the object that you selected. Enter C/AL code in the triggers that you want to use, or modify the existing triggers.
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Click Tools and then click Compile (F11) to test and compile the form. This will include the code that you added or modified.