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Problems with Tooltip background

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :WPF
I am attempting to get a tooltip with a transparent background so that I can create a rounded corner tooltip.  What is happening is that I see a rounded corner tooltip with my info correct but there is a rectangular background to the tooltip that I cannot identify. The code for the tooltip (as of this minute) is : <Button.ToolTip> <Border Background="Red" BorderThickness="5" BorderBrush="DarkBlue" > <Border CornerRadius="10" Padding="10"> <Border.Background> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FF3184CB" Offset="0" /> <GradientStop Color="#FFB6CFE2" Offset="0.994" /> </LinearGradientBrush> </Border.Background> <StackPanel Orientation="Vertical" Background="Transparent" > <StackPanel Orientation="Horizontal" > <Image Source="{Binding Path=DisplayURICached}" Height="120" Width="120" ></Image> <StackPanel Orientation="Ver

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