Add New Item Dialog Box

Is it possible to edit the Add New Item dialog box in Visual Studio where if I select class, a list if access modifiers appears at the bottom in radio button format?  I know how to create a template, but I don't want to create a template for each access modifier.  I have gone through the VSIX articles on Microsoft but can't find how to edit a dialog box in Visual Studio.  I'm not sure if the Add New Item dialog box is considered a Tools Window.