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This reproduces only on VS 2010. MonoDevelop does not reproduce it.
Create a new layout, delete the default LinearLayout, then drag and drop TableLayout from toolbox. It shows "The layout could not be loaded: Object reference not set to an instance of an object." message on the designer.
Tested on 4.2.3 beta.
This is caused by a NRE in TreeViewBackend. Eric, can you take a look at this?
Fixed in XWT edea10667e