OnlineMonitorSystem/HandyControl/HandyControl_Shared/Themes/Styles/PopupWindow.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:ex="clr-namespace:HandyControl.Tools.Extension"
    xmlns:hc="clr-namespace:HandyControl.Controls"
    xmlns:interactivity="clr-namespace:HandyControl.Interactivity"
    xmlns:langs="clr-namespace:HandyControl.Properties.Langs">

    <Style TargetType="hc:PopupWindow">
        <Setter Property="WindowStyle" Value="None" />
        <Setter Property="MinHeight" Value="220" />
        <Setter Property="UseLayoutRounding" Value="True" />
        <Setter Property="BorderThickness" Value="20" />
        <Setter Property="ShowInTaskbar" Value="False" />
        <Setter Property="MinWidth" Value="300" />
        <Setter Property="ResizeMode" Value="NoResize" />
        <Setter Property="Background" Value="{DynamicResource RegionBrush}" />
        <Setter Property="SizeToContent" Value="WidthAndHeight" />
        <Setter Property="Effect">
            <Setter.Value>
                <DropShadowEffect
                    BlurRadius="15"
                    Opacity=".6"
                    ShadowDepth="0" />
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="hc:PopupWindow">
                    <Border Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                                <RowDefinition />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>
                            <Grid
                                Name="TitleGrid"
                                Height="30"
                                Background="{DynamicResource TitleBrush}">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition />
                                    <ColumnDefinition Width="Auto" />
                                </Grid.ColumnDefinitions>
                                <TextBlock
                                    Name="PART_TitleBlock"
                                    Padding="{StaticResource DefaultControlPadding}"
                                    VerticalAlignment="Center"
                                    Background="Transparent"
                                    Foreground="White"
                                    Text="{TemplateBinding Title}"
                                    TextTrimming="WordEllipsis"
                                    TextWrapping="Wrap" />
                                <Button
                                    Name="CloseButton"
                                    Grid.Column="1"
                                    Width="44"
                                    Height="28"
                                    Margin="0,0,1,0"
                                    Padding="9"
                                    hc:BackgroundSwitchElement.MouseDownBackground="Red"
                                    hc:BackgroundSwitchElement.MouseHoverBackground="Red"
                                    Background="Transparent"
                                    Command="interactivity:ControlCommands.Close"
                                    Foreground="White"
                                    IsCancel="True"
                                    Style="{StaticResource ButtonCustom}">
                                    <Path Fill="{Binding ElementName=CloseButton, Path=Foreground}" Style="{StaticResource ClosePathStyle}" />
                                </Button>
                            </Grid>
                            <Border
                                Name="PART_MainBorder"
                                Grid.Row="1"
                                BorderBrush="{DynamicResource TitleBrush}">
                                <StackPanel>
                                    <TextBlock
                                        Name="MyTextBlock"
                                        MinHeight="110"
                                        MaxWidth="300"
                                        Padding="32"
                                        Background="{TemplateBinding Background}"
                                        Foreground="{DynamicResource PrimaryTextBrush}"
                                        Text="{TemplateBinding ContentStr}"
                                        TextAlignment="Center"
                                        TextTrimming="CharacterEllipsis"
                                        TextWrapping="Wrap" />
                                    <StackPanel
                                        Margin="0,0,0,32"
                                        HorizontalAlignment="Center"
                                        Background="{DynamicResource RegionBrush}"
                                        Orientation="Horizontal">
                                        <Button
                                            MinWidth="80"
                                            Margin="0,0,16,0"
                                            Command="interactivity:ControlCommands.Cancel"
                                            Content="{ex:Lang Key={x:Static langs:LangKeys.Cancel}}"
                                            IsCancel="True"
                                            Visibility="{TemplateBinding ShowCancel,
                                                                         Converter={StaticResource Boolean2VisibilityConverter}}" />
                                        <Button
                                            MinWidth="80"
                                            Command="interactivity:ControlCommands.Confirm"
                                            Content="{ex:Lang Key={x:Static langs:LangKeys.Confirm}}"
                                            IsDefault="True"
                                            Style="{StaticResource ButtonPrimary}" />
                                    </StackPanel>
                                </StackPanel>
                            </Border>
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="ShowBorder" Value="True">
                            <Setter TargetName="PART_MainBorder" Property="BorderThickness" Value="1,0,1,1" />
                        </Trigger>
                        <Trigger Property="ShowTitle" Value="False">
                            <Setter TargetName="TitleGrid" Property="Visibility" Value="Collapsed" />
                            <Setter Property="Background" Value="Transparent" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>