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When trying to set an id for a view that has none set yet, an exception is thrown (Object reference not set to an instance of an object).
Only checked with Visual Studio (2010 and 2012).
How to replicate
1. Create a new layout
2. Try to set an id to root element
1. Open an existing layout
2. Clear the id of an existing element
3. Try to set an id to the same element
Fixed. Thanks for reporting.