in reply to How to popup a widget such as “entry” or “label” at the mouse location

I assume that I should be able to able to popup simple widgets.

Why? The docs say

You've probably had occasion to use a Dialog (or DialogBox) widget. These widgets are derived from a Toplevel (which is a subclass of Tk::Wm, the window manager)

A Tk::Frame is not a Toplevel

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