it is know when debugging with alert can mess with events. Can you try with console.log(e.context) instead and see if we have same issue.
If you still reproduce it can you try reproduce with Kendo View and ActiveSheet in jsbin sandbox so we can troubleshoot it? There is Add Library and chose Kendo UI version depending your project Kendo version.
(2012.3.1114 = Kendo UI Q3; 2012.2.710= Kendo UI Q2)
the Telerik team
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