Stackpanel IsMouseOver Trigger does not change to true - wpf

Question

I have a Stackpanel with a Image in it. The Image is partly transperent.
So i want the Background to be Red, when the mouse is not over (which works). But wen the mouse is over it should turn into green. But it doesn't work. Can you please help me out.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:shell="clr-namespace:System.Windows.Shell;assembly=PresentationFramework">
<Style x:Key="PhoenixWindowStyle" TargetType="{x:Type Window}">
<Setter Property="shell:WindowChrome.WindowChrome">
<Setter.Value>
<shell:WindowChrome GlassFrameThickness="0"
ResizeBorderThickness="1"
CaptionHeight="32"
CornerRadius="0"/>
</Setter.Value>
</Setter>
<Setter Property="Background" Value="{DynamicResource DefaultBackgroundBrush}"/>
<Setter Property="MinWidth" Value="100"/>
<Setter Property="MinHeight" Value="100"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Grid Background="{DynamicResource BorderBrush}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="1"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="32"/>
<RowDefinition Height="*"/>
<RowDefinition Height="1"/>
</Grid.RowDefinitions>
<DockPanel Grid.Column="1" Grid.Row="0">
<TextBlock DockPanel.Dock="Left" Margin="0, 2, 0, 2" Padding="0">
<Image Width="24"
Height="24"
Margin="2"
Source="{TemplateBinding Icon}"
SnapsToDevicePixels="True"
RenderOptions.EdgeMode="Aliased" />
<Run BaselineAlignment="Center"
Text="{TemplateBinding Title}"
Foreground="{DynamicResource DefaultBackgroundBrush}"/>
</TextBlock>
<TextBlock DockPanel.Dock="Right" HorizontalAlignment="Right">
<!--This it the part I showed before -->
<StackPanel Width="38" Height="32">
<StackPanel.Style>
<Style TargetType="StackPanel">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Green"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="False">
<Setter Property="Background" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
</StackPanel.Style>
<Image
Width="38"
Height="32"
Margin="0"
Source="../Images/FrameControlIcons/38x32/close.png"/>
</StackPanel>
<!--/////////////////////-->
</TextBlock>
</DockPanel>
<DockPanel Grid.Column="1" Grid.Row="1" >
<ContentPresenter />
</DockPanel>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>

Answer 1

My co-worker recognized the problem. The Problem was, that my Image was covered by the CaptionHeight of the WindowChrome. When i set the CaptionHeigt to zero it works.
So i found a solution to make both work. The CaptionHeight (To drag the window around) and the mouse event on Element that are coverd by the CaptionHeight.
I had to set this property on the affected element:
shell:WindowChrome.IsHitTestVisibleInChrome="True"
I found this Solution here:
How can I add a button to the WPF caption bar while using custom window chrome?