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I have to develop a semi-transparent form in WPF, but controls should not be transparent. I have tried different things like setting opacity=0.5 but no result. I know that AllowTransparency can be set to True only if WindowStyle set to None, but I need to show Border as well UPDATE: Pavlo Glazkov, What is your opinion for this solution <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" Opacity="1" AllowsTransparency="True" WindowStyle="None" Background="Transparent"> <Grid Background="Transparent"> <Border Margin="2,2,12,34" Name="border1" BorderBrush="Lavender" BorderThickness="5" CornerRadius="20,0,20,0"></Border> <Button Height="23" Margin="93,101,110,0" Name="button1" VerticalAlignment="Top" Background="CadetBlue" Foreground="White">Hello WPF</Button> <Button Height="24" Margin="0,8,20,0" Name="button2" VerticalAlignment="Top" HorizontalAlignment="Right" Width="21" Click="button2_Click">X</Button> </Grid> </Window>

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