Q:

How to always show alert of my Cocoa application pop up all other applications? 

I create the app simple.  the app just remind work.  I have problem how to my Alert always show pop up all other app.  I tried code but my alert will hide when use other app I want my alert look like this alert in image
I tried code

let myPopup: NSAlert = NSAlert()
    myPopup.messageText = "Notification"
    myPopup.informativeText = "Hello world"
    myPopup.alertStyle = NSAlertStyle. WarningAlertStyle
    myPopup.addButtonWithTitle("OK")
    myPopup.addButtonWithTitle("Cancel")
    myPopup.runModal()

But when I use other app it hide. 
I want always show alert. 
You can tutorial code example help me ? 
I just beginner.  I want writer app remind simple.  I spent a whole day to do it but i can't.  please help me. 

A:

You can modify the windowLevel property of your alerts window object.  NSModalPanelWindowLevel should give the desired effect.