How do I correctly bind a Popup to a ToggleButton?

Question

I am trying to do something that seems relatively simple and logic from a user interface level but I have one bug that is very annoying. I have a ToggleButton a

Answer 1

Set StaysOpen="True" for your Popup

From MSDN:

Gets or sets a value that indicates whether the Popup control closes when the control is no longer in focus.

[...]

true if the Popup control closes when IsOpen property is set to false;

false if the Popup control closes when a mouse or keyboard event occurs outside the Popup control.