Application ending when start-up is closed

I have a logon screen that is my start-up form. With a successful logon the user is taken to a MDI Parent form where they can choose what they need to do from the menu. The problem is how do I stop the application from ending when the logon start up form is closed. It ends the app if I use me.close or click the X button on the form....any suggestions?


thanks,
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