Exactly. Frames are a "permanent" part of the cardboard panel, except when the cardboard is junk and the frame pulls out with the switch like this:
Ugh!
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When the tab areas of the cardboard are reinforced with some sheetmetal, the frames stay put.
In this pic, you can see the four black "spring clips" at the four corners that click into small round studs inside the frame...and those spring clips hold tenaciously, thus the tabs pulling out of the old crappy cardboard.
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And finally, this is the switch slightly popped out of the frame and the awful black connector that started failing in 1972. That's why I soldered pigtails directly to the switch pins, to eliminate that terrible connector and essentially make a new harness. You can also see the small round stud in the frame that engages the switches' spring clips.
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