i want to make changes in the stranger dialog box. Anybody know how?

I have done dll wrap of the system dll and i have wraped one function from the original dll.And i need to make a changes in the dialog box from the wraped dll when it shown.I can get handle of the dialog box but that's all.Anybody know how?
Excuse my terrible english please.

I am not really sure what you mean. Can you describe it a bit more in details please

Sally