IsExpandedChanged Event bug?

[Roy Halvorsen]

We are using a telerik radgrid and would like to be able to expand - and then load - the details for each row on demand. On the radgridView, we added a ToggleDetailsColum, like this:

        <telerik:RadGridView.Columns>
              <telerik:GridViewToggleRowDetailsColumn />

Then we try to capture the IsExpandedChanged Event on the gridviewRow. I.e. this event:
IsExpandedChanged (Occurs when GridViewRow changes its GridViewRow.IsExpanded state)


But what happens is that everytime we click on the rowdetailsexpander (+), the system throws an exception:
A first chance exception of type 'System.ArgumentException' occurred in Telerik.Windows.Data.dll
And the event never seems to occur.

Is this a bug in 2010.2.812.40?

[Veselin Vasilev]

Hello Roy Halvorsen,

The IsExpandedChanged event fires when you have hierarchy. You are using RowDetails and that is why the event does not fire. You can subscribe to the RowDetailsVisiblityChanged event instead.

This blog post could be useful as well:
Asynchronous Master-Details with RadGridView for Silverlight and WCF RIA Services

Regards,
Veselin Vasilev
the Telerik team