Thanks for the quick feedback Johan. Only problem is: as a Newbie I haven't a clue how to proceed from your first instruction above. Can you elaborate on the next steps please?
Mark a field on your second tab.
In the Hide object enter a statement in Inspector tab Data
YourFieldname = "Red"
This will make the selected object disappear if you in your Radio buttons have chosen Red
You should learn more FileMaker by looking at free training material at FileMaker Training Series