Hi, filmfreak:

I don't know if this is the best way of doing it, but it's how I have done it. When I need a child to change parameters in the main window, y send to the child, in example a dialog, a pointer to the main form. Now with that pointer, I am able to change any widget, control or variable in the main window.

If this is what you want, I can send you an example code.

Good luck!