>I created a WinForm form from the out-of-the-box base form. How can I now re-define it to be based on a custom form clas my own class library that I want to build?
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>Where would I go to tell the form what it is based on?

Matt, if your project has a reference to that custom class (or if it's already in the same project), all you need to do is go into the code for the form you want to change and replace "System.Windows.Forms.Form" with "MyForm".

~~Bonnie