Modify "Click here to add new item" Text

[Chris Moore]

I want to change the text that the grid displays when row insert is enabled. What property controls this? Note, although somewhat related this question: 
http://www.telerik.com/community/forums/silverlight/gridview/modify-click-here-to-add-new-item-location.aspx 

does not address the same scenario. I am not interested in localization/translation; I just want to set the text to something else at runtime.

Thanks.