</ItemsControl.ItemTemplate>
<ItemsControl.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="GroupItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="GroupItem">
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" HorizontalAlignment="Center" FontWeight="Bold" Foreground="{StaticResource Accent}" Text="{Binding Path=Name , StringFormat={}{0:D}}" />
<ItemsPresenter Grid.Row="1"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</ItemsControl.GroupStyle>
</ItemsControl>
<Interactivity:Interaction.Triggers>
<Interactivity:EventTrigger EventName="ScrollChanged" >
<Presentation:InvokeDelegateCommandAction Command="{Binding ChatScrollViewer_OnViewChange}" CommandParameter="{Binding RelativeSource={RelativeSource Self}, Path=InvokeParameter}" />
</Interactivity:EventTrigger>
</Interactivity:Interaction.Triggers>
</ScrollViewer>
private void ChatScrollViewer_OnViewChangeEvent(ScrollChangedEventArgs Event)
{
ScrollViewer scrollViewer = Event.OriginalSource as ScrollViewer;
if (scrollViewer.VerticalOffset == 0)
{
}
}
</ItemsControl.ItemTemplate
