How do I hide the menubar on OSX after starting an application like iTunes?

[William de Smet]

Hi there,

I made a stack which hides, on startup,  the menubar (and Dock) on OS X.
On the stack there is just one button that starts iTunes.
After starting iTunes the menubar and Dock are visible again till I quit iTunes.

Is there a way to hide the dock and menubar after iTunes started?

Greetings,

William de Smet