Issue with Button Hover Image in WPF - wpf

Question

I am attempting to change a button image when there is a mouse hover over in and I cant seem to get it to work. I have accomplished to get the blue hue to not appear when the button is hovered over but cannot get the image to change now. I have read numerous posts on it here and followed other examples but cant make it work. When I use the code below and hover over the button the image remains the same and doesn't change to the new one specified. Thoughts?
Blue Hue Removal
<Window.Resources>
<Style x:Key="ButtonStyleNoHighlighting" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid Background="{TemplateBinding Background}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
Button Hover Image
<Button x:Name="btnCloseApp"
Click="Application_Close"
Style="{StaticResource ButtonStyleNoHighlighting}">
<Button.Background>
<ImageBrush ImageSource="Resources/BTN_Close.png"/>
</Button.Background>
<Button.Resources>
<ControlTemplate x:Key="BackgroundButton" TargetType="Button">
<Border Name="border" BorderThickness="1" BorderBrush="Black" Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background">
<Setter.Value>
<ImageBrush ImageSource="Resources/BTN_Close_Hover.png" />
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Resources>
</Button>
Any help would be greatly appreciated!