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If you try to create a UIActionSheet with a null title (as is possible in Objective-C), you get an ArgumentNullException. The same happens if you try to set the Title property to null. Using string.Empty instead of null results in undesirable empty space above the action sheet buttons.
Objective-C constructor reference: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIActionSheet_Class/Reference/Reference.html
StackOverflow discussion: http://stackoverflow.com/questions/9012959/is-there-a-reason-i-cant-pass-null-as-the-title-to-the-uiactionsheet-constructo
Fixed in 90b69e7651f5b3a2e5996cfa4dd32c483bbdac1f
Thanks for the report!