<Window x:Class="WPF熊俊.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:local="clr-namespace:WPF熊俊"

        AllowsTransparency="True" WindowStyle="None" Background="Transparent" 

        Style="{DynamicResource Mainwindow}" WindowStartupLocation="CenterScreen" >

    <Window.Resources>

        <ControlTemplate x:Key="ResizeDecoratorTemplate" TargetType="Control">

            <Grid>

                <local:ResizeThumb Height="3" Cursor="SizeNS" Margin="0 -4 0 0"

           VerticalAlignment="Top" HorizontalAlignment="Stretch"/>

                <local:ResizeThumb Width="3" Cursor="SizeWE" Margin="-4 0 0 0"

           VerticalAlignment="Stretch" HorizontalAlignment="Left"/>

                <local:ResizeThumb Width="3" Cursor="SizeWE" Margin="0 0 -4 0"

           VerticalAlignment="Stretch" HorizontalAlignment="Right"/>

                <local:ResizeThumb Height="3" Cursor="SizeNS" Margin="0 0 0 -4"

           VerticalAlignment="Bottom"  HorizontalAlignment="Stretch"/>               

            </Grid>

        </ControlTemplate>        

        <Style x:Key="Mainwindow" TargetType="{x:Type Window}">

            <Setter Property="Template">

                <Setter.Value>