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Asked: 2026-05-11T01:58:22+00:00

I’m making my first foray into WPF – I have a simple form with

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I’m making my first foray into WPF – I have a simple form with a popup defined for inline help. I’m using rounded corners, and for some reason a black background is bleeding through around the corners. I don’t understand which element is causing the problem.

alt text http://www.awbrey.net/rounded.jpg

I assume it’s something blindingly obvious which I’m just not seeing. Here’s the XAML I’m using:

<Window x:Class='Consent.Client.SubjectNumberEntry'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' FontSize='24'     Title='SubjectNumberEntry' WindowStyle='None' WindowState='Maximized'         xmlns:h='clr-namespace:Consent.Client' KeyDown='windowOuter_KeyDown' Background='White' Name='windowOuter' AllowsTransparency='true' Loaded='Window_Loaded'>      <StackPanel Height='400' DockPanel.Dock='Top' HorizontalAlignment='Center' VerticalAlignment='Center' Margin='10'>         <StackPanel Height='60' Orientation='Horizontal' VerticalAlignment='Center'>             <TextBox Name='txtSubjectNumber' Margin='10' Width='400' KeyDown='txtSubjectNumber_KeyDown' h:HelpProvider.HelpString='Enter the subject identifier, or scan their wristband'>                 <TextBox.ToolTip>This is a textbox</TextBox.ToolTip>             </TextBox>             <Button Name='btnEnter' Margin='10' Width='100' Click='btnEnter_Click'>Enter</Button>             <Button Width='50' Name='btnHelp' Margin='10' Click='btnHelp_Click'>?</Button>             <Button Width='50' Name='btnExit' Margin='10' Click='btnExit_Click'>Exit</Button>           </StackPanel>         <Label Name='lblValue' Margin='10'></Label>           <Popup Placement='Bottom' HorizontalAlignment='Center' VerticalOffset='10' MouseDown='popHelp_MouseDown' PopupAnimation='Fade' Name='popHelp' PlacementTarget='{Binding ElementName=txtSubjectNumber}'>             <Border Padding='10' Margin='10' BorderBrush='CornflowerBlue' BorderThickness='1' CornerRadius='10' Background='CornflowerBlue'>                 <TextBlock FontSize='12' Background='CornflowerBlue'>This is the content of the help box.</TextBlock>             </Border>         </Popup>      </StackPanel>   </Window>
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1 Answer

  1. I think it is the Popup that is causing the problem. Try setting AllowsTransparency to True on the popup.

    Popup.AllowsTransparency

    When set to False, any transparent colors are ‘merged’ with black.

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