I have an app winth one window and one panel, attached to this window.
steps:
How to set focus to the main window (parent window) from the panel?
It is not clear what you mean by focus, and whether what you call main window is a main window as defined in Cocoa. Assuming it is a Cocoa main window and focus is the same as key status,
[[NSApp mainWindow] makeKeyWindow];
or
[[NSApp mainWindow] makeKeyAndOrderFront:self];
If it is not a Cocoa main window, you need to have a reference to it and send it -makeKeyWindow
or -makeKeyAndOrderFront:
.