Hi Fabio,
Did you manage the grid view control by the extension? In order to do this you just have to drag & drop DataGridView Extension component design time from the VS.NET 2008 Toolbox on your root container then select the grid you wish to manage and set the value of its property ‘IsManagedByExtension’ to true.
Is your grid view control populated with data?
Sincerely Yours,
Support Team