Thanks Alex,

but I got
Error 1 'System.Windows.RoutedEventArgs' does not contain a definition for 'Record' and no extension method 'Record' accepting a first argument of type 'System.Windows.RoutedEventArgs' could be found (are you missing a using directive or an assembly reference?) C:\download\testColorLine\testColorLine\testColorLine\Window1.xaml.cs 70 25 testColorLine

private 

void expandingHandle(object sender, RoutedEventArgs  e)
{  
   var xx = (e.Record as DataRecord).Cells[0];
}

Steve

Hello Steve,

the problem is in the handle

it should be like this:

private void expandingHandle(object sender, Infragistics.Windows.DataPresenter.Events.RecordExpandingEventArgs e)
        {

}

Hi Alex,

It works!  Thanks a lot!
By thwe way, If I want to do it in MVVM way,  how to bind  RecordExpanding to a property in the ViewModel file.

Thanks!

Steve

Hello Steve,

First thing that comes in my mind is using the IsExpanded property of the record and bind it to it.

Alex.

Hi Alex
Could you pelase porvide more info how to do bind to Record's property or provide a simple sample?
Thanks!

Steve

Hello,

It is a property of the Record

Alex.

Alex, 

But I can't find  IsExpanded property  under  XamDataGrid.

Thanks!
Steve