set a blank window in GUI

good Morning, I have a question: I created a program in gui with various edit texts, pushbuttons, static texts, popup menus,listboxes, etc.

When I try to select items for the second time, either the first ones remain written in the boxes(static texts, f.e.) or they remain highlighted, or the values remain in the "memory"..

I just want to "reset" all the properties at the end of the program, so that I can run a new one without the ancient value saved...

Is there a way to do it?