Maximum custom window loses drop shadow effect

Question

I have a custom WPF window defined as:

Answer 1

Here's some minimal code that does what you're after.

This window behaves like a usual window in that it can be:

• resized via its edges
• dragged within the title area
• right-clicked the title area to show the system menu
• maximised/restored by double clicking the title area
• snapped to the sides of your screens by dragging or using hotkeys (Win 10)

It also has a drop shadow.

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The end result looks like this: