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Qt C++ How to create a toolbar from another file (How to declare MainWindow in a seperate headerfile)

jacobjakub asked
Last Modified: 2015-12-03
I try from a seperate Headerfile to create a toolbar with buttons in MainWindow. I get the error
"MainWindow was not declared in this scope".
I am trying to organise my code in different files, for having a better view of it, and to have "modules" for later (re)use.  I am not even sure which approach is correct for that.

This is what I have:

QToolBar *toolbar = new QToolBar(MainWindow);

But get the error above.

Is there an expert who can help me further with this.
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