🚀 go-pugleaf

I would like to make a base class that essentially acts as an interface to
all forms in my application.  I would like to then create forms which will
derive from the base class using the following class declaration:

class TFrom1 : public TForm, public BaseClass

Borland, however, will not let me compile this.  Can someone PLEASE, PLEASE,
PLEASE tell me why!!!  Any ideas on how I could inbed common functionality
into a form so that I can have a clean interface to them.  I need to ensure
EVERY form will implement a certain function.  I don't really care that it
is a form, only that we have a contract that the function I need will be
implemented and I can call it.

I will be storing the base class pointers in a vector<BaseClass> myForms and
calling a function something like myForms[x].UpdateState();

Please help if you can!!

The reason this is important is because I want IDE independent capabilities.
Users will derive from my base class and make their forms and I want to call
the UpdateState function and not care about whether it is a Borland TForm or
a MSVC++ form.  Does anyone know why I can't do multiple inheritance with a
Borland form?????

THANK YOU SOOOOO MUCH!!!