CreateDirectory problem

hello,
I want to create a folder with a '_' in the folder name, but it seems that createDirectory just doesn't like this idea?

When I run
CreateDirectory $INSTDIR\directory_SomeOtherText

it only create " $INSTDIR\directory" and drops the rest, can someone tell me why and how to create this directory

Ehsan

Sorry. The CreateDirectory is working correctly, problem was some where else.