@learnist
No, you can't change over something to do with instances to become static.

You might create some static/global pointer for yourself and set it to point to a particular instance of a window or a widget or your textbox or something. Or, you might "walk" your windows to find what you are looking for, starting from, say, static QWidgetList QApplication::topLevelWidgets().

@Mark81
No problem.

@Chris-Kawa Thanks for the information provided. Then I need to re-design my implementation accordingly to this limitation.