How to reset selection?

Hi ALL,

I am new to WD.I have created a WDA with two views.1st view have selection screen 2nd view displays the details.I have placed a back buttom in 2nd view and used pulgs to go back to 1st screen.

But when come back to 1st screen the selection screen is not geting refreshed.Can any one explain how to clear the selection screen in the first view when i press the back button in 2nd view.