[MonoTouch] Actions do not work ("Could not parse expression'[Action ("btn_Start_Click:")]')

[joergsc]

Hi!

I have an updated project (from Xcode 3 to Xcode 4.2.1). When I create a new
ViewController and define a button on this(with outlet and action) it does
not work.
I tried: 
this.btn_Start.TouchUpInside+=(sender,e)=>{....} in ViedDidLoad as well as 
partial void btn_Start_Click (UIButton sender)
But when you click the button, nothing happens - not even an error message.
There is an Outlet and an Action in the .designer.cs file:
[Outlet]
MonoTouch.UIKit.UIButton btn_Start { get; set; }

[Action ("btn_Start_Click:")]
partial void btn_Start_Click (MonoTouch.UIKit.UIButton sender);

I set a breakpoint and when I hover over the Action in the designer file,
the message-bubble says:
"Could not parse expression'[Action ("btn_Start_Click:")]'

when I hover over this.btn_Start.TouchUpInside+= the bubble says: 'Unknown
member:'TouchUpInside'

I have now idea, what I made / goes wrong.
Any ideas?
Thx, Jörg

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