You can use RadGridView.AddingNewDataItem event to provide whatever object you want to enter in the grid.
Indeed RadGridView.CurrentCell is a read only property. We'll try to introduce some improvements related to this case, such as CurrentColumn which with combination with CurrentItem will give you a CurrentCell, for the upcoming Q1 2010 service pack. Meanwhile there is an option you can use with an ObservableCollection as a data source. I'm attaching a sample project for a reference.
If this doesn't help, please provide me with more info about your scenario (type of the data source to which RadGridView is bound and any information you can find useful)?
Greetings,
Nedyalko Nikolov
the Telerik team
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