pigna
Create another Control node, which I will call "Background Control" for simplicity. On top of this node, add the Control node you're interested in; let's call "Main Control". Write code so that when the "Background Control" is clicked, it gains focus. This way, the focus is switched from "Main Control" to "Background Control". Tree structure could be this:
-Parent
--------Background Control
------- Main Control
OR this:
-Parent
--------Background Control
---------------Main Control