Background items are clickable when tapped anywhere on screen to dismiss PopUp

[ikyh]

I am showing a PopUp when I click on the cell in TableView. PopUp disappears when I tap outside the PopUp view. But the problem is, I have a tabBar having 3 tabs at the the bottom of the screen and when I tap on the tabBar, the viewController related to clicked tab appears. Since alpha is 0.7 the background appears to be slightly dark, but the items in background are clickable when we tap outside PopUp view.
I don't want that to happen. When I tap anywhere outside the PopUp it should just disappear and I should be able to the TableView properly. Please fix this issue.