Can someone help me with a messagebox/ pop-up with two buttons?

I want to have a safety option in my Mach4 software. When I click on "Enable" I need a messagebox with the question: "Refereren?" and two buttons "Ja" and "Nee". These are the options "Yes" and "No" for the question if RefAllHome can be executed or not.

Thanks in advance.

Here is a thread I started when I asked the same question a little while back.  It hadn't been answered on the forum at that time.

http://www.machsupport.com/forum/index.php/topic,36207.0.html