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When one Designer is open, like the iOS Designer, you are unable to then open that same code in the source code editor, or vice versa.
Steps to Reproduce:
1. Create an iOS project in Xamarin Studio
2. Add new Storyboard, keep it open
3. Right click storyboard in the project view, select Open With-> Source Code Editor
Expected Results: Editor Opens
Actual: Nothing happens
4. Close iOS designer
5. Right Click storyboard, select Open With-> Source Code Editor
6. Source Code Editor opens
Can repeat with the steps switched as well for same behavior. (Open Source Code editor first, will be unable to open designer).
The issue is that XS does not allow you to re-open a file under a different editor if it is already open in an editor.
*** This bug has been marked as a duplicate of bug 17197 ***