On Motorola Droid X, on clicking on home button why application exists? it just has to go background

Question

My application works fine on samsung, sony erricson and emulators.. but when i checked on droid x, the home button works weird.

Usually on clicking on the home button, current app has to run in background, but in droid it is exists and when i start the application again from menu, it starts from the beginning but not from where i left the application.

Do i have to do anything in coding? i tried handling the home button myself, but after reading the document, it says home button can not be used in applications. Is there any way to do this? please help.. Thank you..