How to create a "Command" like event when a DataGridCell is being edited

Question

In my program I have a DataGrid with 4 different columns. I would like to make it so that, in one of the columns, when a cell is selected for editing, I am able to change the content of that cell programmatically. For example, on edit, the current string value in the selected cell might change to "selected". I've looked through the DataGridCell class here, and haven't really found anything that would detect an edit to a cell. It would be nice if there was like some "cellClick" event for each DataGridTextColumn in xaml. How do I achieve this type of handler?

The xaml of my DataGrid:

<DataGrid ItemsSource="{Binding SysModel.SystemCollection}" MinColumnWidth="50" ColumnHeaderStyle="{StaticResource HeaderStyle}" RowStyle="{StaticResource RowStyleWithAlternation}" CellStyle="{StaticResource CenterCellStyle}"
          RowHeaderWidth="0" AlternationCount="2" GridLinesVisibility="Horizontal" SelectionUnit="Cell" CanUserAddRows="False" AutoGenerateColumns="False" Height="471" Name="dataGrid1" Width="468" Canvas.Left="40" Canvas.Top="17">
    <DataGrid.Columns>
        <DataGridTextColumn Header="{DynamicResource cart}" Width="Auto" IsReadOnly="True" Binding="{Binding cartNum}" />
        <DataGridTextColumn Header="{DynamicResource ipAddress}" Width="100" IsReadOnly="False" Binding="{Binding ipAddress}" />
        <DataGridTextColumn Header="{DynamicResource portNumber}" Width="70" IsReadOnly="False" Binding="{Binding PortNumber}" />
        <!-- **This is the column that contains the cells I want to have this event for** -->
        <DataGridTextColumn Header="{DynamicResource configuration}" Width="*" IsReadOnly="False" Binding="{Binding Configuration}" />
        </DataGrid.Columns>
        <DataGrid.Resources>
            <SolidColorBrush Color="#726AA5" x:Key="{x:Static SystemColors.HighlightBrushKey}" />
        </DataGrid.Resources>
</DataGrid>

Answer 1

DataGridCell fires Selected event when it is selected. I presume Before it is being edited by user, it should be selected.

Source: DataGridCell Events