Several ways can be possible.
1. Trigger "Accessible object".
2. Wait for control disabled.
3. Wait for accessible object disabled.
4. Wait for color.
1 is the best. It can be used only if the button is an accessible object and it fires events when disabled. You'll need trigger data: menu -> Tools -> Output -> Log -> Acc trigger events. More info in QM help.
1. Trigger "Accessible object".
2. Wait for control disabled.
3. Wait for accessible object disabled.
4. Wait for color.
1 is the best. It can be used only if the button is an accessible object and it fires events when disabled. You'll need trigger data: menu -> Tools -> Output -> Log -> Acc trigger events. More info in QM help.