New Post: MaskTextBox 1.9.0 does not work without "Xceed.Wpf.Toolkit"

Hey. I created an application which uses MaskedTextBox. That is okay. However, if I make a "Release" of project and take from one place to another then an application stops working. But If I add "Xceed.Wpf.Toolkit.dll" in folder where the application is situated then it works perfectly!
How to get over this problem?
I would like that my application to work without "Xceed.Wpf.Toolkit.dll".
Best regards!