how to enlarge horizzontally, not vertically, a window ??

Question

Hi,
the question is that:
I vould like to enlarge horizzontally, not vertically, a window
I red this article: http://www.codeproject.com/csharp/shrinkarea.asp where they show how to enlarge vertically a window, but I need an similar example to enlarge horizzontally.. now I do some tests but if somebody could help me to do that..i'll thank very much
Lula