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The Details Methods tab is used to create and view methods for the component being edited.
When you double-click on a method, a statement invoking this method is inserted into the source of your component in the position where the cursor is in the 3.20 Source Tab.
So if you double-click the MaximizeForm method for a form and your cursor is in the Click event of #PHBN_1, a statement invoking the MaximizeForm method of the form is inserted in the Click event:
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EVTROUTINE HANDLING(#PHBN_2.Click)
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INVOKE METHOD(#COM_OWNER.MaximizeForm)
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ENDROUTINE