Custom ShowDialog() method for WPF

My developers career starts in 1995, when my father bought my first PC and gave my book "QBasic".
Than it was Pascal, Delphi, C++ Builder...But when I began to work with .Net in 2008, I understand, that this technology is exactly what I need

For now, I am a Senior .Net developer at Luxoft.

P.S. Right now I am extremly looking for a legal job offer from USA.