Hello again Keith,
If you persist selected items in the returned data. For instance, each object has a selected property or something like this, then you will need to wire the change event of the widget's datasource and grep selected items. In general, this is not practical and I strongly suggest you persist selected values in a separate object/property and when widget is defined to set value option:
//specify the array that contains the data
In order to help you further I will need a runnable jsFiddle/jsBin demo.
the Telerik team
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