BeWoPlaner/BeWo/View/BeWoWindow.xaml

<Window
    x:Class="BeWo.View.BeWoWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="BeWoPlaner"
    MinWidth="300"
    MinHeight="300"
    AllowsTransparency="True"
    Background="Transparent"
    Closed="Window_Closed"
    Closing="Window_Closing"
    ResizeMode="CanResizeWithGrip"
    WindowStartupLocation="CenterOwner"
    WindowStyle="None">
    <Grid>
        <GroupBox
            x:Name="rootGroupBox"
            MouseDoubleClick="RootGroupBox_OnMouseDoubleClick"
            MouseLeftButtonDown="RootGroupBox_OnMouseLeftButtonDown"
            Style="{DynamicResource MainContentGroupBoxWithoutMaximizeBtnStyle}" />
    </Grid>
</Window>