Find and Update Control Values before InsertForm of Radgrid Opens

Suppose if You wants to change RadDatePicker Min date which is inside insert Item

So before the form OPens You can change this value On RadGrid Item Command

 protected void RadGrid3_ItemCommand(object sender, GridCommandEventArgs e)

    {

        if (e.CommandName == RadGrid.InitInsertCommandName)

        {

            e.Canceled = true;            

            System.Collections.Specialized.ListDictionary newValues = new System.Collections.Specialized.ListDictionary();            

            e.Item.OwnerTableView.InsertItem(newValues);

            string selected = RadYear.SelectedItem.Text;

            GridEditableItem insertItem = e.Item.OwnerTableView.GetInsertItem();

            RadDatePicker dtt = (RadDatePicker)insertItem.FindControl("RadDatePicker3") as RadDatePicker;

            dtt.MinDate = Convert.ToDateTime(selected + "-01-01");

            dtt.MaxDate = Convert.ToDateTime(selected + "-12-31");

        }

    }