Put a "column header" over the ScrollViewer of a WPF ComboBox ControlTemplate - wpf

Question

here is my sample project updated from this thread:
WPF: Refine the look of a grouped ComboBox vs. a grouped DataGrid -sample attached -
http://www.sendspace.com/file/ru8hju (VS2010 .Net 4.0 project)
My question is now HOW can I add a "column header" like stackpanel horizontal with 2 TextBlocks ADD to my existing ComboBox ControlTemplate ABOVE the ScrollViewer when I have a custom ComboBoxItem stuff and there is the ItemPresenter in the default ComboBox ControlTemplate.
Thats my existing grouped uneditable ComboBox. Over the Scrollviewr (above the December...) I want 2 Textblocks.
How can I do that with MY XAML code see at the bottom:
<Window x:Class="TestComboGrouped.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="600" Width="200">
<Window.Resources>
<SolidColorBrush x:Key="SelectedBackgroundBrush" Color="Orange" />
<SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />
<Style x:Key="ComboBoxItemStyle" TargetType="ComboBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBoxItem">
<Grid HorizontalAlignment="Stretch"
Margin="-5,0,0,0"
Background="{TemplateBinding Background}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="45"/>
</Grid.ColumnDefinitions>
<Border Name="border1"
BorderThickness="0,0,1,1"
BorderBrush="#FFCEDFF6"
Grid.Column="0">
<TextBlock Foreground="Purple"
HorizontalAlignment="Right"
Margin="0,0,5,0"
Text="{Binding WeeklyLessonDate, StringFormat='yyyy-MM-dd'}"/>
</Border>
<Border Name="border2"
BorderThickness="0,0,1,1"
BorderBrush="#FFCEDFF6"
Grid.Column="1">
<TextBlock HorizontalAlignment="Center"
Text="{Binding WeekNumber}"/>
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsHighlighted" Value="true">
<Setter TargetName="border1" Property="Background" Value="{StaticResource SelectedBackgroundBrush}"/>
<Setter TargetName="border2" Property="Background" Value="{StaticResource SelectedBackgroundBrush}"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Foreground" Value="Red"/>
<Style.Triggers>
<Trigger Property="ComboBox.AlternationIndex" Value="0">
<Setter Property="Background" Value="White"></Setter>
</Trigger>
<Trigger Property="ComboBox.AlternationIndex" Value="1">
<Setter Property="Background" >
<Setter.Value>
<LinearGradientBrush RenderOptions.EdgeMode="Aliased" StartPoint="0.5,0.0" EndPoint="0.5,1.0">
<GradientStop Color="#FFFEFEFF" Offset="0"/>
<GradientStop Color="#FFE4F0FC" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
<!-- Grouped CollectionView -->
<CollectionViewSource Source="{Binding WeeklyDateList,IsAsync=False}" x:Key="WeeklyView">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="MonthName"/>
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Window.Resources>
<StackPanel>
<ComboBox
ItemsSource="{Binding Source={StaticResource ResourceKey=WeeklyView}}"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ItemContainerStyle="{StaticResource ComboBoxItemStyle}"
AlternationCount="2"
MaxDropDownHeight="300"
Width="Auto"
x:Name="comboBox"
>
<ComboBox.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<TextBlock
Padding="5,0,0,0"
Background="White"
Foreground="DarkBlue"
FontSize="14"
FontWeight="DemiBold"
Text="{Binding Name}"/>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ComboBox.GroupStyle>
<!--<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Border Style="{StaticResource ComboBoxBorderStyle}">
<TextBlock Width="100" Foreground="Purple" Text="{Binding WeeklyLessonDate, StringFormat='yyyy-MM-dd'}"/>
</Border>
<Border Style="{StaticResource ComboBoxBorderStyle}">
<TextBlock Padding="5,0,5,0" Width="40" Text="{Binding WeekNumber}"/>
</Border>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>-->
</ComboBox>
</StackPanel>
</Window>
UPDATE:
OK very good news, I found my old code again which I thought I lost it somehow :)
Below you see the Style for a ComboBox. I have pasted some own xaml there see my comment
inside the ControlTemplate below. There is the Column Header of a former ComboBox.
What I want now is to merge this Column Header with my above project and its custom ComboBoxItem
style.
<Border x:Name="DropDownBorder" BorderBrush="DarkBlue" BorderThickness="2" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
// ColumnHeader START
<StackPanel >
<StackPanel Orientation="Horizontal">
<TextBlock HorizontalAlignment="Stretch" Text="lesson day" />
<TextBlock HorizontalAlignment="Stretch" Text="week" />
</StackPanel>
// ColumnHeader END
<ScrollViewer x:Name="DropDownScrollViewer" Background="Green">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="{Binding Background, ElementName=DropDownBorder}" Height="{Binding ActualHeight, ElementName=DropDownBorder}" Width="{Binding ActualWidth, ElementName=DropDownBorder}"/>
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</ScrollViewer>
</StackPanel>
</Border>
</Popup>
<ToggleButton BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxReadonlyToggleButton}"/>
<ContentPresenter ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="false" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
<Setter Property="Background" Value="#FFF4F4F4"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsEditable" Value="true">
<Setter Property="BorderBrush" Value="{StaticResource TextBoxBorder}"/>
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
<Setter Property="IsTabStop" Value="false"/>
<Setter Property="Padding" Value="3"/>
<Setter Property="Template" Value="{StaticResource ComboBoxEditableTemplate}"/>
</Trigger>
</Style.Triggers>
</Style>
combobox with column header =>
http://img573.imageshack.us/img573/4202/columnheader.png
Hello,
UPDATE 2:
This is the code with a column header but trashed POPUP + Scrollbars do not work properly... I could not post the code due to 30000 chars limitation lol so grab it here:
http://www.sendspace.com/file/8puii8

Answer 1

Update again
Also fixed it in your example, just changed the Popup from the one I had below. Download if from here.
This screenshot is from this link