Trying to access the objects on Appeon's Ribbon Menu.

Try adding the property value of WndClass to MSAA in Project Settings, to see if TC is able to identify objects.

I guess that control is not supported by TC.

I have never worked with PowerBuilder before. But poking around I see this:

https://support.smartbear.com/testcomplete/docs/app-testing/enterprise-apps/power-builder/classic.html#ConfiguringPBApplication

This mentions adding the class name (and how/which class) to MSAA and also something that needs to be done in the PowerBuilder project. 

Wish I had more info.

Does you app meet the requirements of supported PowerBuilder versions - With TestComplete, you can create and run tests for applications created with PowerBuilder Classic version 12.0, 12.5, 12.5.2 and 12.6?

Try enable the * in MSAA.