I have a screen with various buttons, one of which pops up a native keyboard where the user can input into a single line text field. The problem is other buttons remain active on the part of the screen not covered up by the keyboard popup. If the player clicks on any of the other buttons the keyboard and text field remain on screen with no way to remove them.

Any ideas or suggestions on how I can disable the background objects? I'd prefer not to have to remove the background screen when the keyboard is up. Basically I want modal behavior for the popup keyboard/text entry field, which seems like the expected behavior for a popup text entry field anyway.