Beko DVG 9531 control panel problem?

Hello,
I have a question about my mum's Beko gas cooker. It's kind of silly really: she was cleaning it earlier and pulled one of the burner control knobs out too far while trying to clean behind it. The control knob pinged off across the kitchen and now neither of us has the first idea how to get it back on. We've been trying for hours with no luck. If anyone could help, that would be great, since the manual says you can't use the rangetop unless all controls are in place, we're now gas-ring-less :(