Find textboxes inside a radgridview cell

[ivan]

Hi, when i use the FindName always return null.
What i need is to find a textboxt in a cell in a specific row, to make focus in that textbox.

Here is the XAML

<telerik:GridViewDataColumn.CellTemplate>
                                                            <DataTemplate>
                                                                <TextBox Name="txtTotalGrossAmount"  Text="{Binding TOTAL_GROSS_AMT,   Mode=TwoWay}"
                                                            </DataTemplate>
                                                        </telerik:GridViewDataColumn.CellTemplate>


In run time the radGridView has 4 rows, where this textbox is repeated in each row, but if i validate this textbox in the second row that cant not be null value , then i want to make a focus in this textbox in the second row.