ScrollViewer content is scrolling over other parts of window - wpf

Question

I have the following as part of my XAML:
<DockPanel>
<ToolBar Name="toolbar1" DockPanel.Dock="Top" Height="41" Background="#FFA5D95A">
//other controls
</ToolBar>
<ScrollViewer>
<ListBox Name="listBox1" ItemsSource="{Binding ElementName=This, Path=Items}"
ItemTemplateSelector="{StaticResource entryItemTemplateSelector}">
<ListBox.Template>
<ControlTemplate>
<WrapPanel IsItemsHost="True" />
</ControlTemplate>
</ListBox.Template>
</ListBox>
</ScrollViewer>
</DockPanel>
I want the scrool bar to move the items in the ListBox just to the top of the WrapPanel, and then to stop showing them when they get to the top; in stead, these items scroll into the ToolBar at the top.
What am I doing wrong?
Note: Haing been asked, here are the DataTemplates I currently have; EntryItemHost is a type derived from WindowsFormsHost.
<DataTemplate x:Key="folderTemplate">
<my:EntryItemHost Item="{Binding}"
Background="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=my:MainWindow, AncestorLevel=1}, Path=Background}"
DoubleClick="FolderDoubleClick" />
</DataTemplate>
<DataTemplate x:Key="imageTemplate">
<my:EntryItemHost Item="{Binding}"
Background="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=my:MainWindow, AncestorLevel=1}, Path=Background}" />
</DataTemplate>

Answer 1

Instead of setting ListBox Template set the ItemsPanel and remove the ScrollViewer
sample
<DockPanel>
<ToolBar Name="toolbar1"
DockPanel.Dock="Top"
Height="41"
Background="#FFA5D95A">
//other controls
</ToolBar>
<ListBox Name="listBox1" ItemsSource="{Binding ElementName=This, Path=Items}"
ItemTemplateSelector="{StaticResource entryItemTemplateSelector}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Width="{Binding ActualWidth, RelativeSource={RelativeSource FindAncestor, AncestorType=ContentPresenter}}" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</DockPanel>
notice that I have replaced the template with ItemsPanel and restricted the width to the listbox
I made this based on the assumptions, let me know is this not what you are looking for