Expander not display All values

Question

Hi All,

 

My WPF window have below code,

 

<DockPanel LastChildFill="True">

<StackPanel Height="45" DockPanel.Dock="Top" VerticalAlignment="Top" HorizontalAlignment="Stretch">

<Expander Header="Test" >

<StackPanel Orientation="Vertical">

<TextBlock Text="Open" Foreground="Silver"/>

<TextBlock Text="New" Foreground="Silver"/>

<TextBlock Text="Edit" Foreground="Silver"/>

</StackPanel>

</Expander>

</StackPanel>

</DockPanel>

 

I don't want to change any container control