Horizontal RadioButtons in ListBox - wpf

Question

In WPF I am trying to binding radio buttons to a property in the ViewModel such as this SO answer https://stackoverflow.com/a/2285732
Everything works fine, except that the Buttons are stacked Vertically. Now, this seems an easy fix, just modify the ItemsPanelTemplate.
Here's my code:
<ListBox ItemsSource="{Binding ItemOptions}" SelectedItem="{Binding SelectedOption}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" IsItemsHost="True" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}" >
<RadioButton Content="{TemplateBinding Content}"
IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsSelected}"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
However, the items remain stacked vertically. Any ideas why this has no effect on the orientation of the ListBox?

Answer 1

Try this:
<ListBox.Template>
<ControlTemplate TargetType="{x:Type ListBox}">
<ScrollViewer x:Name="scrollviewer"
HorizontalScrollBarVisibility="Visible" CanContentScroll="False">
<StackPanel IsItemsHost="True" Orientation="Horizontal" />
</ScrollViewer>
</ControlTemplate>
</ListBox.Template>
I tried to get this working with the ItemsPanelTemplate, as you did, without success. This worked great for me.
Regards

Answer 2

Here is a basic example without styling. Note that the WrapPanel handles the layout.
<ListBox Margin="0,10,0,0"
ItemsSource="{StaticResource Orders}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel HorizontalAlignment="Stretch"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<RadioButton Content="{Binding CustomerName}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Data with the model defined in code behind.
<Page.Resources>
<model:Orders x:Key="Orders">
<model:Order CustomerName="Alpha"
OrderId="997"
InProgress="True" />
<model:Order CustomerName="Beta"
OrderId="998"
InProgress="False" />
<model:Order CustomerName="Omega"
OrderId="999"
InProgress="True" />
<model:Order CustomerName="Zeta"
OrderId="1000"
InProgress="False" />
</model:Orders>
</Page.Resources>
Result