Hello Mariam.

Sorry for my English, probably I should have written "I was advised".

Your English is fine < s >. I am just easily confused < s >.

Want to make this button accessible when user chooses something, so put in InteractiveChange just one line.

How about this code in the combo's Valid()? The Valid fires whenever the user picks something from the list:

Thisform.Button1.Enabled = ( This.ListIndex > 0 )