Notification Control in Silverlight

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:Balloon">

    <local:AlignmentConverter x:Key="Converter"/>

    <Storyboard x:Key="Close">
        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)">
            <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
            <EasingDoubleKeyFrame KeyTime="0:0:0.4" Value="0"/>
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>

    <Storyboard  x:Key="Open">
        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)">
            <EasingDoubleKeyFrame KeyTime="0" Value="0"/>
            <EasingDoubleKeyFrame KeyTime="0:0:0.4" Value="1"/>
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>

    <Style TargetType="local:Balloon">
        <Setter Property="FontSize" Value="13"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:Balloon">
                    <Grid>
                        <Grid.Effect>
                            <DropShadowEffect ShadowDepth="2" Direction="315"/>
                        </Grid.Effect>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <Border Grid.Row="1" BorderBrush="Gray" BorderThickness="1" CornerRadius="5" Margin="{Binding Alignment, Converter={StaticResource Converter}, RelativeSource={RelativeSource TemplatedParent}, ConverterParameter=MainMargin}">
                            <Border.Background>
                                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                    <GradientStop Color="#FFE7E8F1" Offset="1"/>
                                    <GradientStop Color="White"/>
                                    <GradientStop Color="#FFF3F4F6" Offset="0.472"/>
                                </LinearGradientBrush>
                            </Border.Background>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto"/>
                                    <ColumnDefinition Width="*"/>
                                </Grid.ColumnDefinitions>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <Image Source="{TemplateBinding Icon}" Margin="5"/>
                                <TextBlock Margin="5" Grid.Column="1" Foreground="#FF28489F" Text="{TemplateBinding Header}" FontSize="16"
                                           VerticalAlignment="Center"/>
                                <ContentPresenter Margin="5" Grid.Column="1" Grid.Row="1"/>
                            </Grid>
                        </Border>
                        
                        <Path Data="M306.375,133.125L306.375,100.875L335.75,133.25" Stroke="Gray" Height="20" Fill="White" Margin="{Binding Alignment, Converter={StaticResource Converter}, RelativeSource={RelativeSource TemplatedParent}, ConverterParameter=Margin}"
                              StrokeThickness="1" Stretch="Uniform" Visibility="{Binding Alignment, Converter={StaticResource Converter}, RelativeSource={RelativeSource TemplatedParent}, ConverterParameter=bottom}" VerticalAlignment="Center" HorizontalAlignment="{Binding Alignment, Converter={StaticResource Converter}, RelativeSource={RelativeSource TemplatedParent}, ConverterParameter=Alignment}"/>

                        <Path Data="M306.375,133.125L306.375,100.875L335.75,133.25" Stroke="Gray" Height="20" Fill="#FFE7E8F1" Margin="{Binding Alignment, Converter={StaticResource Converter}, RelativeSource={RelativeSource TemplatedParent}, ConverterParameter=Margin}"
                              StrokeThickness="1" Stretch="Uniform" Grid.Row="2" Visibility="{Binding Alignment, Converter={StaticResource Converter}, RelativeSource={RelativeSource TemplatedParent}, ConverterParameter=top}" VerticalAlignment="Center" RenderTransformOrigin="0.5, 0.5" HorizontalAlignment="{Binding Alignment, Converter={StaticResource Converter}, RelativeSource={RelativeSource TemplatedParent}, ConverterParameter=Alignment}">
                            <Path.RenderTransform>
                                <ScaleTransform ScaleY="-1"/>
                            </Path.RenderTransform>
                        </Path>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>