Add Image to ToolTip

   
     



<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="160" Width="300">
    <Window.Resources>
        <Style TargetType="{x:Type ToolTip}">
            <Setter Property="Width" Value="100"/>
            <Setter Property="Height" Value="100"/>
            <Setter Property="OverridesDefaultStyle" Value="True"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate 
                        TargetType="{x:Type ToolTip}">
                        <Border Name="Border"
                            BorderBrush="DarkGray"
                            BorderThickness="1"
                            Width="{TemplateBinding Width}"
                            Height="{TemplateBinding Height}"
                            CornerRadius="4">
                            <StackPanel Orientation="Horizontal">
                                <Image Margin="4,4,0,4" Source="c:image.gif"/>
                                <ContentPresenter
                                  Margin="4" 
                                  HorizontalAlignment="Left"
                                  VerticalAlignment="Top" />
                                </StackPanel>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

    </Window.Resources>

    <Grid>
            <TextBlock Foreground="DarkGray" 
                       VerticalAlignment="Center" 
                       HorizontalAlignment="Center"
                       ToolTip="This is a custom tooltip"
                       Text="Mouse Over for tooltip"/>
    </Grid>
    
</Window>