Row height don't include scrollviewer ability - wpf

Question

I'm currently creating a new WPF window which look like this :
The part starting with "Filter and with the array is define like this :
<Grid Grid.Row="2" Visibility="{Binding FilterVisibility}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock Margin="20,0,0,0" HorizontalAlignment="Left"
Text="{Binding Source={x:Static dictionnaries:MainDictionnary.bcfFilter}, StringFormat={}{0} :}"/>
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" MinWidth="150"/>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ItemsControl Grid.Column="1" Margin="2" Grid.IsSharedSizeScope="True"
ItemsSource="{Binding Filters}">
<ItemsControl.Template>
<ControlTemplate>
<Border Background="White" BorderBrush="Black" BorderThickness="1">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="col1"/>
<ColumnDefinition Width="1" SharedSizeGroup="marg"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col2"/>
<ColumnDefinition Width="1" SharedSizeGroup="marg"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col3"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Text="{x:Static dictionnaries:MainDictionnary.filterField}"
Grid.Column="0"
Margin="5,2"/>
<Line Grid.Column="1"
Y2="{Binding ActualHeight, Mode=OneWay, RelativeSource={RelativeSource Self}}"
Stroke="Gray"
HorizontalAlignment="Center"/>
<TextBlock Text="{x:Static dictionnaries:MainDictionnary.filterCondition}"
Grid.Column="2" Margin="5,2"
TextWrapping="WrapWithOverflow" TextAlignment="Center"/>
<Line Grid.Column="3"
Y2="{Binding ActualHeight, Mode=OneWay, RelativeSource={RelativeSource Self}}"
Stroke="Gray"
HorizontalAlignment="Center"/>
<TextBlock Text="{x:Static dictionnaries:MainDictionnary.filterValue}"
Grid.Column="4" Margin="5,2"
TextWrapping="WrapWithOverflow" TextAlignment="Center"/>
</Grid>
<Line Grid.Row="0" Fill="Black"
X2="{Binding ActualWidth, Mode=OneWay ,RelativeSource={RelativeSource Self}}"
Stroke="Black" VerticalAlignment="Bottom"/>
<ScrollViewer Grid.Row="1" MinHeight="50" VerticalScrollBarVisibility="Auto">
<ItemsPresenter/>
</ScrollViewer>
</Grid>
</Border>
</ControlTemplate>
</ItemsControl.Template>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="col1"/>
<ColumnDefinition Width="1" SharedSizeGroup="marg"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col2"/>
<ColumnDefinition Width="1" SharedSizeGroup="marg"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col3"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ComboBox Grid.Column="0" VerticalAlignment="Center" Margin="3" SelectedItem="{Binding Field}"/>
<Line Grid.Column="1"
Y2="{Binding ActualHeight, Mode=OneWay, RelativeSource={RelativeSource Self}}"
Stroke="Gray"
HorizontalAlignment="Center"/>
<ComboBox Grid.Column="2" VerticalAlignment="Center" Margin="3" SelectedItem="{Binding Condition}"/>
<Line Grid.Column="3"
Y2="{Binding ActualHeight, Mode=OneWay, RelativeSource={RelativeSource Self}}"
Stroke="Gray"
HorizontalAlignment="Center"/>
<TextBox Grid.Column="4" VerticalAlignment="Center"
HorizontalAlignment="Left" Margin="3"
MinWidth="50"
Text="{Binding Value, UpdateSourceTrigger=PropertyChanged, NotifyOnTargetUpdated=True}"/>
<Line VerticalAlignment="Bottom"
Grid.ColumnSpan="6" Grid.Column="0"
X2="{Binding ActualWidth, Mode=OneWay, RelativeSource={RelativeSource Self}}"
Stroke="Black"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<StackPanel Grid.Column="2" Margin="0,0,20,0">
<Button Height="{Binding ActualWidth, RelativeSource={RelativeSource Self}}" Margin="2" Padding="0"
Command="{Binding AddFilterCommand}">
<Path Stroke="Black" StrokeThickness="1" VerticalAlignment="Center">
<Path.Data>M0,5 H10 M5,0 V10</Path.Data>
</Path>
</Button>
<Button Height="{Binding ActualWidth, RelativeSource={RelativeSource Self}}" Margin="2"
Command="{Binding RemoveFilterCommand}">
<Path Stroke="Black" StrokeThickness="1" VerticalAlignment="Center">
<Path.Data>M0,0 H8</Path.Data>
</Path>
</Button>
</StackPanel>
</Grid>
The visibility of this part is controled by my viewmodel. Until this everything is working nice, but when I add new rows to the array with the + button, I would like the array not to grow but use a ScrollViewer. So in the ItemControl.template is added the scrollViewer.
But I got this result :
How can I get the scrollviewer to work ?

Answer 1

Set the Height of the second RowDefinition to *:
<RowDefinition Height="*"/>
Or set the Height property of the ItemsControl or ScrollViewer.
A ScrollViewer must have a constrained height to be able to calculate the scrollable view port.