Topic: Keil RTX5 RTOS not detected

I have successfully imported a Keil uVision project into Visual Studio 2022 with VisualGDB.  The project was mostly hand-built and does not use any Keil packs.  It includes the RTOS2 library rtx_cm4f.lib.  The VisualGDB Embedded Debug Tweaking menu has Embedded RTOS support set to automatic.  While debugging, when I select Debug->Windows->RTOS Objects->Threads, it shows “No RTOS is detected”.  How do I tell VisualGDB that RTX5 is being used and enable the RTOS window features?