Not exactly a tab-navigational experience that...but yes, if you e.g. do a key detection detecting the tab key, then check if the last (or prior one to the subpane's first) in the key order on the main has focus, you can send a message e.g. to the subpane-VI to put focus on its first control, then tab onwards from there. Then you have to do the reverse when getting to the last control in the tabbing order in the subVI to get focus back up to the main... 🙄
LabVIEW should handle this automatically based on the key order of the given subpane and whatever VI is on display there.
