Inheritance Picker Dialog Box
Allows you to specify which component a new form or user control will derive from. This dialog box appears when you use the Add New Items dialog box to add an inherited form or an inherited control to your Windows-based application. All classes created with Visual Basic are inheritable by default. Because forms are classes, you can use inheritance to define new forms based on existing forms.
If you have created a new project, you need to compile that project before you can use the Inheritance Picker dialog box.