<Button Content="12345">
<Button.ContextMenu>
<ContextMenu Name="cm">
<MenuItem Header="File"/>
<MenuItem Header="Save"/>
<MenuItem Header="SaveAs"/>
<MenuItem Header="Recent Files">
<MenuItem Header="ReadMe.txt"/>
<MenuItem Header="Schedule.xls"/>
</MenuItem>
</ContextMenu>
</Button.ContextMenu>
</Button>
<Window.Resources>
<ContextMenu x:Key="MyContextMenu">
<!--Ваше меню -->
</ContextMenu>
</Window.Resources>
<Grid>
<!-- колонки строки -->
<TextBox Tag="1" Grid.Column="1" Grid.Row="5" ContextMenu="{StaticResource MyContextMenu}"/>
<TextBox Tag="2" Grid.Column="2" Grid.Row="5" ContextMenu="{StaticResource MyContextMenu}"/>
</Grid>