Hello Ernesto Morin,
You can check these articles for more information about the drag drop scenarios:
http://www.telerik.com/help/silverlight/raddraganddrop-getting-started-scenarios.html
http://demos.telerik.com/silverlight/#DragAndDrop/TreeToGrid
If these do not help, could you please send post some additional information about our scenario - code behind and XAML.
Regards,
Tsvyatko
the Telerik team
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