//WPF Part
<Window x:Class="i4pro_gruppe_d.View.HomingRobot"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="" Height="150" Width="350" ResizeMode="NoResize" ShowInTaskbar="False">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="20"/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition Width="20"/>
        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="45"/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>

        <Label Grid.Column="1" Grid.ColumnSpan="3" FontSize="25" Content="Homing Robot" HorizontalAlignment="Center"/>
        <ProgressBar Grid.Column="1" Grid.ColumnSpan="3" Grid.Row="1" IsIndeterminate="True" />
        <Label Grid.Column="1" Grid.ColumnSpan="3" Grid.Row="2" Content="This can take a few minuts.." HorizontalAlignment="Center" />
        </Grid>
</Window>


#Code behind
using System.Windows;
using GalaSoft.MvvmLight.Messaging;

namespace i4pro_gruppe_d.View
{
    public partial class HomingRobot : Window
    {
        private Messenger messengerInstance;
        public HomingRobot()
        {
            InitializeComponent();

            messengerInstance = Messenger.Default;
            messengerInstance.Register<bool>(this, "HomingDone", CloseWindow);
        }

        private void CloseWindow(bool b)
        {
            this.Close();
        }
    }
}