Multiple instance of application startup form.

Application Tools :Pocket PC 2003 , WINCE.NET , .NET CF , VC# My startup form has 6 buttons ..each allowing user to jump to next screen. Also every other screen returns to startup screen. When I execute the application & navigate thru. Every time i see a new instance of my startup form created at background. i.e, when i leave my startup screen that particular instance doen't get closed/disposed. My project requirements doesn't allow me to do FindWindow and DestroyWindow. Could anyone suggest me why it is happenning and how to control it. Thanks, Ratna