Chat/ChatController/LoginControl.xaml

<UserControl x:Class="ChatController.LoginControl"
             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" 
             mc:Ignorable="d">
    <Grid>
        <Grid.Background>
            <ImageBrush>
                <ImageBrush.ImageSource>
                    <BitmapImage UriSource="Ressourcen/ownChat-Background.png" />
                </ImageBrush.ImageSource>
            </ImageBrush>
        </Grid.Background>

        <Grid Name="RootGrid">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Border Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center" x:Name="GroupBoxLogin" >
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="200"/>
                    </Grid.ColumnDefinitions>

                    <Label FontSize="15" Grid.Column="0" Grid.Row="0" Margin="3" Foreground="White">Kundennummer:</Label>
                    <TextBox FontSize="15" Grid.Column="1" Grid.Row="0" Margin="3" VerticalContentAlignment="Center" Text="{Binding Path=Tenant, UpdateSourceTrigger=PropertyChanged}"/>

                    <Label FontSize="15" Grid.Column="0" Grid.Row="1" Margin="3" Foreground="White">ChatCode:</Label>
                    <TextBox FontSize="15" x:Name="TextBoxChatCode" Grid.Column="1" Grid.Row="1" Margin="3" VerticalContentAlignment="Center" Text="{Binding Path=ChatCode, UpdateSourceTrigger=PropertyChanged}"/>

                    <Label FontSize="15" Grid.Column="0" Grid.Row="2" Margin="3" Foreground="White">Benutzername:</Label>
                    <TextBox FontSize="15" x:Name="TextBoxBenutzerName" Grid.Column="1" Grid.Row="2" Margin="3" VerticalContentAlignment="Center" Text="{Binding Path=UserName, UpdateSourceTrigger=PropertyChanged}" />

                    <Label FontSize="15" Grid.Column="0" Grid.Row="3" Margin="3" Foreground="White">Passwort:</Label>
                    <PasswordBox FontSize="15" x:Name="PasswordBox" Grid.Column="1" Grid.Row="3" Margin="3" VerticalContentAlignment="Center" />

                    <Button FontSize="15" Grid.ColumnSpan="2" Grid.Column="0" Grid.Row="5" VerticalContentAlignment="Center" Click="AnmeldenButton_OnClick" Content="Anmelden" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="3" Width="100" Height="40" Background="#ff5e00" HorizontalContentAlignment="Center" >
                        <Button.Resources>
                            <Style TargetType="{x:Type Border}">
                                <Setter Property="CornerRadius" Value="5"/>
                                <Setter Property="Padding" Value="1" />
                            </Style>
                        </Button.Resources>
                    </Button>
                </Grid>
            </Border>
            <Label HorizontalAlignment="Right" VerticalAlignment="Bottom" Foreground="White" Content="{Binding Path=Version, Mode=OneWay}" />
        </Grid>
    </Grid>
</UserControl>