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

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:hc="clr-namespace:HandyControl.Controls">

    <Style TargetType="hc:Sprite">
        <Setter Property="hc:WindowAttach.IgnoreAltF4" Value="True"/>
        <Setter Property="hc:WindowAttach.ShowInTaskManager" Value="False"/>
        <Setter Property="SizeToContent" Value="WidthAndHeight"/>
        <Setter Property="ResizeMode" Value="NoResize"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="ShowActivated" Value="False"/>
        <Setter Property="ShowInTaskbar" Value="False"/>
        <Setter Property="Topmost" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="hc:Sprite">
                    <ContentPresenter Margin="{TemplateBinding Padding}" hc:WindowAttach.IsDragElement="True" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>