HSLColorSelector.xaml

<UserControl x:Class="WPFColorLib.HSLColorSelector" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             SizeChanged="Control_Resized">
    <DockPanel>
        <StackPanel DockPanel.Dock="Top">
            <Slider Name="slidHue" Maximum="359" TickFrequency="10" TickPlacement="BottomRight" />
            <Border Name="brdHue" BorderThickness="1" BorderBrush="DarkGray" Margin="1">
                <Image Name="imgHue" Height="20" />
            </Border>
        </StackPanel>
        <Border Name="brdSaturLight" BorderThickness="1" BorderBrush="DarkGray" Margin="1">
            <Grid>
                <Image Name="imgSaturLight" MinHeight="100" MouseDown="imgSaturLight_MouDown" MouseMove="imgSaturLight_MouMove" MouseUp="imgSaturLight_MouUp" />
                <Canvas Name="cnvSaturLight">
                    <Ellipse Name="ellClrTarget" Width="7" Height="7" StrokeThickness="2" Stroke="Aqua" />
                </Canvas>
            </Grid>
        </Border>
    </DockPanel>
</UserControl>