Take a region screenshot of the right click menu?

Let's say you're using screenshots to compare whether your right click menu has the same values as expected.

 

I press right click, but then when I go to click region checkpoint, the right click menu disappears.

The one way I can think of is to take a screenshot, crop out the right click menu, and compare it - but that would take a lot of time when I have to test a lot of right click menus to verify they have the intended options.

 

Any thoughts on how to freeze the right click menu to allow region capture?