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    <p>Thanks Jefim and Rachel for pushing me into the right direction. For me the missing link was actually the MaxHeight on the CheckGroup DataTemplate as Jefim pointed out. </p> <p>I now set MaxHeight to the axtual height of the window minus some height to make sure the other groups stay visible. </p> <p>I know this might look like a dirty solution, but with some nifty wpf brushes it will look sweet and the behavior is very close to my expectations!</p> <p>Changes to the code to become the behavior I wanted:</p> <p>MainWindow.xaml</p> <pre><code>&lt;Window x:Class="VerticalWrapPanel.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:controls="clr-namespace:VerticalWrapPanel" xmlns:converters="clr-namespace:VerticalWrapPanel" Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded" x:Name="MyWindow"&gt; &lt;Window.Resources&gt; &lt;converters:ActualHeightReduce x:Key="ActualHeightReduce" /&gt; &lt;DataTemplate x:Key="CheckGroupsTemplate"&gt; &lt;controls:CheckGroupControl MaxHeight="{Binding ElementName=MyWindow, Path=ActualHeight, Converter={StaticResource ActualHeightReduce}}" /&gt; &lt;/DataTemplate&gt; &lt;/Window.Resources&gt; &lt;ScrollViewer CanContentScroll="False"&gt; &lt;ItemsControl ItemsSource="{Binding CheckGroups}" ItemTemplate="{StaticResource CheckGroupsTemplate}" /&gt; &lt;/ScrollViewer&gt; &lt;/Window&gt; </code></pre> <p>Addition to MainWindow.xaml.cs (inside the namespace VerticalWrapPanel)</p> <pre><code>public class ActualHeightReduce : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value == null || string.IsNullOrEmpty(value.ToString())) return value; double vValue; if (Double.TryParse(value.ToString(), out vValue)) { return vValue - 75; } return value; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return Binding.DoNothing; } } </code></pre> <p>And the CheckGroupControl.xaml now has a nice horizontal scroll:</p> <pre><code>&lt;UserControl x:Class="VerticalWrapPanel.CheckGroupControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:controls="clr-namespace:VerticalWrapPanel" x:Name="GroupControl"&gt; &lt;UserControl.Resources&gt; &lt;DataTemplate x:Key="CheckTemplate"&gt; &lt;controls:CheckControl /&gt; &lt;/DataTemplate&gt; &lt;/UserControl.Resources&gt; &lt;Expander BorderBrush="Black" Header="TEST" IsExpanded="{Binding ElementName=GroupControl, Path=IsExpanded}"&gt; &lt;ItemsControl ScrollViewer.VerticalScrollBarVisibility="Disabled" ScrollViewer.HorizontalScrollBarVisibility="Auto" ItemsSource="{Binding Checks}" ItemTemplate="{StaticResource CheckTemplate}"&gt; &lt;ItemsControl.Template&gt; &lt;ControlTemplate&gt; &lt;ScrollViewer x:Name="ScrollViewer" Padding="{TemplateBinding Padding}"&gt; &lt;ItemsPresenter /&gt; &lt;/ScrollViewer&gt; &lt;/ControlTemplate&gt; &lt;/ItemsControl.Template&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;WrapPanel Orientation="Vertical" IsItemsHost="True" /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;/ItemsControl&gt; &lt;/Expander&gt; &lt;/UserControl&gt; </code></pre> <p>And of course the Orientation of the wrappanel in the CheckControl still has to be set to Vertical ;)</p>
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    1. POVertical WrapPanel inside expander; I'm not able to wrap at window bottom
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    1. CONice to see you got the result you needed and good luck :)
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