Hey Ron,
I tried to replicate this on my computer but I wasn't able to see the behavior that you saw.  Just to make sure I have the steps right here is what I tried.  
- Placed a tab control on the Front Panel
 - Placed some controls and indicators on the tab control
 - Grouped the controls and indicators
 - Moved the group off of the tab control and Ungrouped
 - Added a control to my group and regrouped
 - Moved the group back to the tab control
 
Is this what you did?  Which version of LabVIEW are you using?  Could you provide a small sample VI that does do this behavior and any steps that I have wrong or left out?  
Thanks!
Andy F.
					
				
			
			
				
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National Instruments