Number box select / deselect (?) key focus

I know you can select a number box, either by clicking or sending it the select message (nice with the tab function, using the number box's right outlet). Is there a way to deselect a number box without clicking on the background? Like a general "keyfocus isn't specified" message to Max?

What's happening is I have a draggable panel that I want to snap to a grid while the "s" key is being held down. If the last object selected / edited is a number box (that is, if any number box currently has focus), the s key (and other keystsrokes for that matter) do get read, but the resulting behavior is strange -- like it's in some "no-man's land" between being interpreted as a keystroke or going into the number box (which it doesn't appear to). Rather tough to explain, but if there's a message to remove keyfocus, that's all I'm after.

--CJ