Solution found : http://stackoverflow.com/questions/2148978/wpf-toolkit-datagrid-selectionchanged-getting-cell-value
private void dataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
DataGrid dataGrid = sender as DataGrid;
if (e.AddedItems!=null && e.AddedItems.Count>0)
{
// find row for the first selected item
DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromItem(e.AddedItems[0]);
if (row != null)
{
DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
// find grid cell object for the cell with index 0
DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(0) as DataGridCell;
if (cell != null)
{
Console.WriteLine(((TextBlock)cell.Content).Text);
}
}
}
}
static T GetVisualChild<T>(Visual parent) where T : Visual
{
T child = default(T);
int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < numVisuals; i++)
{
Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
child = v as T;
if (child == null) child = GetVisualChild<T>(v);
if (child != null) break;
}
return child;
}

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