Access Aggregate Values in roup Header Template

[Tony]

I have my own DataTemplate for displaying a GroupHeader.  I am using aggregates as well. However, I want to customize how the aggregate values are displayed in the group panel. Is there a way to do this? The "ResultFormatString" is insuffcient for what I want to accomplish.

(Hmm.. wish I could edit my title !)

[Pavel Pavlov]

Hi Tony,

What kind of customization are you trying to apply ? Please give me some details so I could point you to the right direction.

Regards,
Pavel Pavlov
the Telerik team

[Tony]

In my custom template for my group header, I have a user control that will display the values from the aggregate functions in a unique way. I basically want to pass /bind the aggregate function results to my user control. Below is my xaml to help communicate what I want.

Telerik Grid:

<telerik:RadGridView x:Name="gridPositionGrades" Grid.Row="1"
    DocumentsInTraining}"
    SelectionMode="Single"
    AutoGenerateColumns="False"
    ShowGroupPanel="False"
    GroupHeaderTemplate="{StaticResource Temp}" >

    <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding DocumentTitle}" Header="Document" >
            <telerik:GridViewDataColumn.AggregateFunctions>
                <telerik:CountFunction Caption="test" x:Name="Count1"  />
                <telerik:SumFunction SourceField="Grade" Caption="sum" x:Name="sum" />
            </telerik:GridViewDataColumn.AggregateFunctions>
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding Grade}" Header="" />
    </telerik:RadGridView.Columns>
    <telerik:RadGridView.GroupDescriptors>
        <telerik:GroupDescriptor Member="PositionCode" SortDirection="Ascending"/>
        <telerik:GroupDescriptor Member="DocumentType" SortDirection="Ascending"/>
        <telerik:GroupDescriptor Member="DocumentCategory" SortDirection="Ascending"/>
    </telerik:RadGridView.GroupDescriptors>
</telerik:RadGridView>

The following is where I'm stuck. I want to pass in the aggregate function values to my user control as such:

<DataTemplate x:Key="Temp">
    <StackPanel Orientation="Horizontal">
        <TextBlock Text="{Binding Group.Key}" />
            <trainingind:TrainingLevelIndicator DisplayType="ALL_TRAINING"
                Level0Count="{Binding RESULT_OF_AGGREGRATE_FUCTION_FOR_Count1???}"
                Level1Count="{Binding RESULT_OF_AGGREGRATE_FUCTION_FOR_sum???}"/>
    </StackPanel>
</DataTemplate>

Ultimately, I will write my own custom aggregate functions

[Pavel Pavlov]

Hello Tony ,

I am attaching a small demo illustrating a scenario with a user control placed in the  group header containing a textblock bound to the result of an aggregate function .

Greetings,
Pavel Pavlov
the Telerik team

[Tony]

Works great.. much simpler than the solution I was coming up with.

Is there documentation on what other properties are available to me at the group level? That is, what other properties can I access in my XAML when customizing the group row?

[Pavel Pavlov]

Hi Tony ,

At that level of the visual tree of RadGridView the DataContext is a GroupViewModel. This is a special class designed to expose anything from the group you may need for your bindings.

Greetings,
Pavel Pavlov
the Telerik team