WrapPanel将项目放在一条长水平线（显示滚动条）而不是包裹线条

<Grid.ColumnDefinitions>
  <ColumnDefinition Width="Auto"/>
  <ColumnDefinition />
</Grid.ColumnDefinitions>

<Grid.RowDefinitions>
  <RowDefinition Height="Auto"/>
  <RowDefinition/>
  <RowDefinition Height="40"/>
</Grid.RowDefinitions>

<c:SearchTextBox Grid.ColumnSpan="2" .../>

<ScrollViewer VerticalScrollBarVisibility="Auto" Grid.Row="1">
  <ListBox 
    ItemsSource="{Binding Categories}" 
    IsSynchronizedWithCurrentItem="True" 
    ... />
</ScrollViewer>

<!-- Here is what I'm talking about:-->
<ListBox ItemsSource="{Binding Products}"
  IsSynchronizedWithCurrentItem="True" Grid.Column="1" Grid.Row="1">
  <ListBox.ItemsPanel>
    <ItemsPanelTemplate>
      <WrapPanel />
    </ItemsPanelTemplate>
  </ListBox.ItemsPanel>
</ListBox>
<Grid.ColumnDefinitions>
  <ColumnDefinition Wi