Good to heard that
Well, It is really fun! And once you have some ide about the widget framework the only real problems are the gc handling/drawing cycles. Events triggered by Windows might drive you crazy the most.
The framework is pretty straight forward and with some codeing in C++ as a template it is quite easy to write a pendant in VAST.
I think you can be glad to have a costumer paying for GUI-Extensions. I wish I had that.
But once again,.... costumers want new look and feel...
By the way! Maybe you should check out if they might also pay a Ribbon integration
Well' If you need further assistance just let me know. This is really fun!