I have Mdi form and child form , toolbar is on the mdi, how to disable toolbar buttons on the mdi form from the chile form and how to call a function on the mdi form from the child form
Not a lot of information there to go on. But here goes...
I presume that you are instantiating an instance of the child form from the parent MDI form? If so, you could pass a pointer through to the child from the parent, so that you can then call public functions (or protected if the child is-a kind-of parent type ;-) ). Then in the parent class declare the functions that do what you want them to do, which can then be called from within the child form.