RadGridView GroupHeaderTemplate will not disappear when group is empty

[Dave Aronow]

I am using the GroupHeaderTemplate to display information about each row
in my radgridview (which is bound to an ObservableCollection<> of my data
class).  I am grouping by a unique field on each row so each item in my
grid will get it's own header.   

My sample code is below.  When I click the "DeleteButton" in the code
below the item is being removed from my collection correctly and the
grid row disappears, but the GroupHeaderTemplate instance for the row 
remains visible even after the item is removed (and all items are
removed).  However the binding to the item disappears since the item
itself is gone (meaning the Description disappears).  

Any idea why this could be?  
Thanks.
Dave

<telerik:RadGridView.GroupHeaderTemplate>

    <DataTemplate>

        <Grid>

            <Grid.ColumnDefinitions>

                <ColumnDefinition Width="20"></ColumnDefinition>

                <ColumnDefinition Width="250"></ColumnDefinition>

            </Grid.ColumnDefinitions>

            <telerik:RadButton Grid.Column="0" x:Name="DeleteButton"
Style="{StaticResource ImageButtonStyle}"
Content="Img/delete.png" Command="telerik:RadGridViewCommands.Delete"
CommandParameter="{Binding Group.Items[0]}">

            </telerik:RadButton>

            <TextBlock Grid.Column="1"
Text="{Binding Group.Items[0].Description}" />

        </Grid>

    </DataTemplate>

</telerik:RadGridView.GroupHeaderTemplate>

[Maya]

Hi David,

I have tested the case, but I was not able to reproduce the issue you reported. Could you take a look at the sample attached and let me know whether you can reproduce the same behavior on it ?  

Greetings,
Maya
the Telerik team

[Dave Aronow]

Your sample works fine .... as expected.

By explicitly calling the Rebind() method as the item is removed from the collection it works.  However, I'm not clear why it doesn't work automatically as the collection derives from ObservableCollection<T>.  Any clue what it could be? 

Thanks.
Dave

[Maya]

Hello David,

Generally, groups are refreshed once CollectionChanged event is fired. 
Could you update my project so that it corresponds to your settings and see whether you can get the same behavior on it ? Is there something that it is missing ? What is the data source that you are working with ? 

All the best,
Maya
the Telerik team

[Dave Aronow]

After upgrading to the latest version of the controls this now works.