WPF Drop Shadow Trigger - wpf

Question

I am creating a button style. Paste this into a window to see the idea:
<Style x:Key="SelectionButton3"
TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
ClipToBounds="False">
<Grid.RowDefinitions>
<RowDefinition Height="75"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Border x:Name="TheBorder"
BorderThickness="0,1.5,1.5,1.5"
CornerRadius="3"
Background="SteelBlue"
Height="35"
Grid.Column="1"
Grid.Row="0"
Margin="-31"
BorderBrush="DarkSlateBlue">
<Border.BitmapEffect>
<DropShadowBitmapEffect x:Name="BorderShadow"
ShadowDepth="0"/>
</Border.BitmapEffect>
</Border>
<Rectangle Fill="SteelBlue"
Stroke="DarkSlateBlue"
Grid.Row="0"
Grid.Column="0">
<Rectangle.LayoutTransform>
<RotateTransform Angle="-45" />
</Rectangle.LayoutTransform>
<Rectangle.BitmapEffect>
<DropShadowBitmapEffect ShadowDepth="5"/>
</Rectangle.BitmapEffect>
</Rectangle>
<ContentPresenter x:Name="ContentArea"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Content="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent}}" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Foreground"
Value="LightGray" />
<Setter Property="FontFamily"
Value="Segoe UI" />
</Style>
<Button Click="Button_Click"
Style="{StaticResource SelectionButton3}"
Width="185">
</Button>
What I would like to have happen is for the Borders drop shadow to appear when the mouse is over either the Border or the Rectangle. I know I need a trigger, but I'm not really sure where & how to do it.
Can someone point me in the right direction?
Thanks

Answer 1

<Style x:Key="SelectionButton3"
TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
ClipToBounds="False">
<Grid.RowDefinitions>
<RowDefinition Height="75"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Border x:Name="TheBorder"
BorderThickness="0,1.5,1.5,1.5"
CornerRadius="3"
Background="SteelBlue"
Height="35"
Grid.Column="1"
Grid.Row="0"
Margin="-31"
BorderBrush="DarkSlateBlue">
</Border>
<Rectangle Name="rect" Fill="SteelBlue"
Stroke="DarkSlateBlue"
Grid.Row="0"
Grid.Column="0">
<Rectangle.LayoutTransform>
<RotateTransform Angle="-45" />
</Rectangle.LayoutTransform>
</Rectangle>
<ContentPresenter x:Name="ContentArea"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Content="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent}}" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="TheBorder" Property="BitmapEffect">
<Setter.Value>
<DropShadowBitmapEffect ShadowDepth="0" />
</Setter.Value>
</Setter>
<Setter TargetName="rect" Property="BitmapEffect">
<Setter.Value>
<DropShadowBitmapEffect ShadowDepth="5"/>
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Foreground"
Value="LightGray" />
<Setter Property="FontFamily"
Value="Segoe UI" />
</Style>
Note that unless you're using .NET 3.0 or 3.5 pre SP1, you should use Effect instead of BitmapEffect. The BitmapEffect property has been deprecated in 3.5 SP1