Make dynamic Language header on datagrid

Question

I have datagrid and some columns header. I make language resource file (English.xaml, Japanses.xaml)

When load dynamic to label on windows is successful (switch between En and Jp is ok), but when load dynamic language to datagrid columns header is unsuccessful.

My xaml on datagrid column
<DataGridTextColumn Visibility="Visible" Header="{DynamicResource colStaft}" IsReadOnly="True" Width="90" Binding="{Binding Path=POST_NAME...></> 

 

Please help me.

 

Thanks.