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ALT doesn't always show ribbon shortcut

Using 19.2, I have an app with a ribbon that has a custom control hosting an UltraTextEditor. When the focus is in this control and the user presses the ALT key sometimes the ribbon shortcuts are not shown, and the application File menu is shown instead (even though Ribbon.FileMenuStyle is set to None)

I have verified that the custom control does receive the WM_SYSKEYDOWN with keyData == Menu | Alt 

I have another app that has a ribbon with no custom controls and it always works as expected (ALT shows ribbon shortcuts).

This seems bug-like, but I'm wondering if there is a way I could just work around it by forcing the shortcuts to appear in the ribbon? Is there even an API to do that?