GeekDesk/Control/Windows/GlobalColorPickerWindow.xaml

<Window x:Class="GeekDesk.Control.Windows.GlobalColorPickerWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:GeekDesk.Control.Windows"
        xmlns:hc="https://handyorg.github.io/handycontrol"
        WindowStyle="None"
        AllowsTransparency="True"
        Background="Transparent"
        KeyDown="OnKeyDown"
        >
    <Border CornerRadius="8" 
            Background="White"
            Height="385"
            Width="228">
        <StackPanel>

            <Border MouseDown="DragMove" 
                    VerticalAlignment="Top" 
                    CornerRadius="8,8,0,0"
                    Height="20" 
                    Background="White"
                    >
                <Button Width="18"  Height="18" 
                        hc:IconElement.Geometry="{StaticResource ErrorGeometry}" 
                        Padding="0" 
                        Background="Transparent"
                        Opacity="0.6"
                        Margin="0,0,5,0"
                        Click="Button_Click"
                        HorizontalAlignment="Right" 
                        MouseEnter="Button_MouseEnter"
                        MouseLeave="Button_MouseLeave"
                        VerticalAlignment="Center">
                    
                </Button>
            </Border>

            <hc:ColorPicker HorizontalAlignment="Center" 
                            VerticalAlignment="Bottom" 
                            SelectedColorChanged="MyColorPicker_SelectedColorChanged"
                            x:Name="MyColorPicker" 
                            Confirmed="MyColorPicker_Confirmed"
                            Canceled="MyColorPicker_Canceled"
                            ToggleButton.Checked="MyColorPicker_Checked"/>
        </StackPanel>
    </Border>
</Window>