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Description of Problem:
A Command's canExecute method/lambda does not get called more than once when bound to a ToolbarItem and the ToolbarItem is clicked.
Steps to reproduce the problem:
1. Create a ToolbarItem.
2. Assign a command to it's Command property with execute and canExecute lambdas.
canExecute is invoked once and never again.
canExecute is invoked every time I click the ToolbarItem.
Visual Studio 2013 Update 4
Apparently "as designed". The real problem is that the CanExecute return value does not Disable/Enable or Hide/Show the ToolbarItem.
New bug report filed about the button not showing as disabled/hidden: https://bugzilla.xamarin.com/show_bug.cgi?id=25661