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Here is a bug. We cannot use Xcode GUI Builder to change properties.
1. Choose: "Start a new Solution"
2. Choose: MonoTouch-Universal Storyboard,
Name: Bug, Master-Detail Application.
3. Double-click: MainStoryboard_iPhone.storyboard.
4. Double-click "Master" in the titlebar. Change the text to: "Bug"
5. Click the Run button on the Xcode screen.
You will see that the build failed.
6. From the Xcode File menu, click: Save.
7. From the Xcode menu, click: Quit Xcode.
8. From MonoDevelop choose Run, Run With: iPhone simulator 5.1
9. You will see that "Master" is still the text in the titlebar.
> 5. Click the Run button on the Xcode screen.
> You will see that the build failed.
It's not meant to run, so this is expected.
That said, the problem seems not to be with the storyboard itself, but rather with MonoDevelop's default Master-Detail project templates.
Look in your RootViewController.cs file and remove the line in the ctor:
Title = NSBundle.MainBundle.LocalizedString ("Master", "Master");
You'll likely have the same problem for the DetailsViewController.
I've fixed this for MonoDevelop 2.8.10