How to set Background in StackPanel
Try this
<Button.ToolTip> <StackPanel Height="200" Width="200"> <StackPanel Height="30" Width="200" Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Top" > <StackPanel.Background> <ImageBrush ImageSource="E:\R\watermark9.bmp" /> </StackPanel.Background> <Image VerticalAlignment="Top" Width="30" Height="30" Source="E:\My Projects\Interconnect_New\Interconnect\Resources\watermark9.bmp" Name="image1" /> <TextBlock FontFamily="Aharoni" FontSize="24" FontWeight="Bold" Foreground="Black" TextWrapping="Wrap" VerticalAlignment="Top" Height="30" HorizontalAlignment="Right" Width="143"> <Run FontFamily="Andalus" FontSize="18" FontWeight="Normal" Text="Hello! Fancy Tip" /></TextBlock> </StackPanel> </StackPanel></Button.ToolTip>