>>I need to implement the following functionality:
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>>Cancel button (and clicking on the Close x button at the top of the form will prompt in case of unsaved changes and let the user to save them or really close/cancel – note, this behavior is non-standard to other application forms where Cancel just cancels without any prompts).
>>
>>So, this is the question I added (see attached), but I am not sure I like it. I am wondering how should I phrase this prompt question - can you please suggest?
>
>It mostly something like: "You have unsaved changes. Do you really want to close this form without saving?". Then, a Yes/No could do. Or, a Yes/Cancel could also apply.

In this particular case I need a question on both Close and Revert buttons (that's what my colleague wrote as design and I decided to go on and implement as is without questioning). So, I am thinking I need the same question that should work for both Revert and Close buttons.

I think I like your idea, I'll think about it a bit.