Not able to add UIbutton to UIscrollview in Monotouch Dynamically - uiscrollview

Question

I am facing a very strange problem. I am trying to add UIbuttons to a UIscrollview in Monotouch. But the UIbutton is not getting displayed.
Here is the code:
UIImage img = UIImage.FromFile("ecu.png");
UIButton btn = UIButton.FromType(UIButtonType.Custom);
btn.SetBackgroundImage(img,UIControlState.Normal);
btn.Frame = new RectangleF(UIScreen.MainScreen.Bounds.Size.Width - 185, 0, 185,UIScreen.MainScreen.Bounds.Size.Height, 100, 150, 150);
btn.TouchUpInside += (sender, e) => {
UIAlertView alert = new UIAlertView("Info","Tapped",null,"Ok",null);
alert.Show();
} ;
scrollimages.AddSubview (btn);
The same code works if i add the button to the View.
Can i get some help on this please.

Answer 1

I just tried the following code after adding a UIScrollView to the View in Interface Builder:
UIImage img = UIImage.FromFile("ecu.png");
UIButton btn = UIButton.FromType(UIButtonType.Custom);
btn.SetBackgroundImage(img,UIControlState.Normal);
btn.Frame = new RectangleF(0.0f, 0.0f, 150.0f, 150.0f);
btn.TouchUpInside += (sender, e) => {
UIAlertView alert = new UIAlertView("Info","Tapped",null,"Ok",null);
alert.Show();
} ;
this.ScrollImages.AddSubview (btn);
and it works as expected. The odd thing seems to be you have 7 parameters for the RectangleF constructor. have you just tried setting the origin to 0,0 to see if a button is added there?