Find Control in datagridview in wpf

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VB

WPF

i ma new in wpf
i want search control in wpf window base i goes some problem
following my code i am right is run true way but cant be check datagrid inside check box check

<DataGrid x:Name="grdshow"   TabIndex="4"  AutoGenerateColumns="False"  ItemsSource="{Binding}"  FontSize="11" HorizontalAlignment="Left"  Margin="10,41,0,0" VerticalAlignment="Top" Width="670" Height="455" IsTabStop="True" RenderTransformOrigin="0.5,0.5" FontFamily="Verdana">
            <DataGrid.Columns>
                <DataGridCheckBoxColumn Header="YES/NO" Width="60" x:Name="chkyesno" Binding="{Binding ACLOCK,Mode=TwoWay}"    />
                <DataGridTextColumn Header="NAME" Width="210"  Binding="{Binding ANAME}"></DataGridTextColumn>
                <DataGridTextColumn Header="ADDRESS" Width="160" Binding="{Binding AADD1}"></DataGridTextColumn>
                <DataGridTextColumn Header="GROUP" Width="130" Binding="{Binding AAGROUP}"></DataGridTextColumn>
                <DataGridTextColumn Header="CODE" Width="100" Binding="{Binding ACODE}"></DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>

vb.net

OCcmd = New SqlCommand("SELECT ACLOCK,ANAME,AADD1,AAGROUP,ACODE from macntmst where aagroup='" & Txtacheadname.Text & "' ", sqlcn)
      OCadp.SelectCommand = OCcmd
      OCadp.Fill(ds_ldrLU)
      dv2 = New DataView(ds_ldrLU)

grdshow.ItemsSource = dv2
     grdshow.AutoGenerateColumns = False
     OCcmd.Dispose()
     Dim rowidx As Integer = grdshow.Items.IndexOf(grdshow.CurrentCell.Item)
     MessageBox.Show("show")

     For Each dr As DataRow In ds_ldrLU.Rows
         Dim vl As String = dr.Item(0)
         If vl = "Y" Then

             TryCast(grdshow.Columns(0).GetCellContent(grdshow.Items(0)), System.Windows.Controls.CheckBox).IsChecked = True

         Else
             DirectCast(grdshow.Columns(0).GetCellContent(grdshow.Items(0)), System.Windows.Controls.CheckBox).IsChecked = False

         End If


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