DragDialogDemo.xaml

<Border x:Class="HandyControlDemo.UserControl.DragDialogDemo"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:hc="https://handyorg.github.io/handycontrol"
             xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
             xmlns:ex="clr-namespace:HandyControlDemo.Tools.Extension"
             x:Name="DraggableRoot"
             mc:Ignorable="d"  
             Height="220" Width="360">
    <Grid>
        <Border CornerRadius="8" Background="{DynamicResource DefaultBrush}">
            <DockPanel Margin="20,10,20,0">
                <Border DockPanel.Dock="Top">
                    <DockPanel>
                        <DockPanel>
                            <Path Stretch="UniformToFill" Fill="{DynamicResource PrimaryTextBrush}" 
               Data="{DynamicResource InfoGeometry}" 
               Width="20" Height="20"></Path>
                            <TextBlock Text="{ex:Lang Key={x:Static langs:LangKeys.Dialog}}" FontSize="{DynamicResource SubHeadFontSize}" FontWeight="Bold" 
Margin="5,10"/>
                            <Rectangle Margin="5,5,20,5"
                                       Style="{DynamicResource RectangleFocusVisual}"
                                       Stroke="{DynamicResource PrimaryBrush}"
                                       Fill="{DynamicResource BorderBrush}" StrokeDashArray="4 4" StrokeThickness="1"
                                       hc:DragAdornerElement.IsDraggable="True"
                                       hc:DragAdornerElement.DragTarget="{Binding ElementName=DraggableRoot}"></Rectangle>
                        </DockPanel>
                    </DockPanel>
                </Border>
                <TextBlock Text="{ex:Lang Key={x:Static langs:LangKeys.ContentDemoStr}}" 
                   FontSize="{DynamicResource TextFontSize}" 
                   Foreground="{DynamicResource SecondaryTextBrush}"
                   TextWrapping="Wrap"
                   Margin="20"/>
            </DockPanel>
        </Border>
        <Button Width="30" Height="30" BorderThickness="0"
        Style="{DynamicResource ButtonIconCircular}" 
        HorizontalAlignment="Right" VerticalAlignment="Top"
        Command="{x:Static hc:ControlCommands.Close}"
        Margin="0,12,10,0"
        hc:IconElement.Geometry="{DynamicResource CloseGeometry}" 
        Padding="8"></Button>
    </Grid>
</Border>