Question

I can send the message makeKeyAndOrderFront: to make a window active. However, if I send this to a window without a title bar, it doesnt make it active. Is there any way to make a window without a title bar active?

Answer 1

You need to override -canBecomeKeyWindow in your NSWindow subclass to return YES.

As per the docs:

Attempts to make the window the key window are abandoned if this
method returns NO. The NSWindow implementation returns YES if the
window has a title bar or a resize bar, or NO otherwise.