NSObject and NSView

I have a subclass of NSObject and a subclass of NSView. I have a button in the NSObject subclass and I want to make the drawing from the NSView subclass redraw(with setNeedsDisplay:YES) when you push the button, but I don't know how.

P.S ["name_of_the_custom_view" setNeedsDisplay:YES] works if I do it from the NSView subclass but not from the other one