An object reference is required for the non-static field,

Question

I got this compile error

 

An object reference is reqired for the non-static field, method, or property MainWindow.MainRib

 

When I do

 

public static void toggle_visibility()

{

     foreach (var ribbonTab in MainRib.Items.OfType<RibbonTab>())

     ....

}

 

If I remove static, the error would be gone from here, but it will show up from the caller

MainWindow.toggle_visibility(). I can create an instance for the class MainRib, but then

that is not the instance I want to modify. So the question is how to modify MainRib

outside of the class?