Ahhh, Thanks for the hint. I was able to install and develop a Hello World app now using the Qt Plugin for VS.
But now there is a (File -> New -> Project) template for a Qt program {GUI, console, etc}; or for a VisualGDB program { Linux, Android, MinGW, etc}. Is there a preferred path for developing a GUI/Linux(Pi) application?
I think I’ve answered my own question (and am posting it here for when I forget!). I was able to open up a previous hello world type app created using a VisualGBD template; double click the MainWindow.ui and that opened the Qt Designer program. From there I could add buttons and link button presses to actions; and then run the program via the debugger! Excellent!!