How do I pass a value from a child back to the parent form?

Question

I have  three forms in my sample editor project. My main form is EditorForm. And my child form is FormEdit. I am trying to display the data from the FormEdit to EditorForm. One important thing my EditorForm is still opened and i need its open. I try to display the data in EditorForm, but data can't display.I need a solution for this problem.