Catel - Part 4 of n: Unit testing with Catel

<Window x:Class="Catel.Windows.TipOfTheDayWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Input="clr-namespace:Catel.Windows.Input;assembly=Catel.Windows"
        Title="Tip of the Day" ShowInTaskbar="False" ResizeMode="NoResize" SizeToContent="WidthAndHeight"
        WindowStartupLocation="CenterOwner">

    <!-- Resources -->

    <!-- Content -->
    <Grid DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}}">
        <DockPanel>
            <!-- Bottom -->
            <Grid DockPanel.Dock="Bottom">
                <!-- Column definitions -->
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="Auto" />
                </Grid.ColumnDefinitions>

                <!-- Do not show again -->
                <CheckBox Grid.Column="0" Content="Do not show again" IsChecked="{Binding DoNotShowAgain}" />

                <!-- Close button -->
                <Button Grid.Column="1" Command="Close" IsCancel="True" Style="{DynamicResource FixedSizeButtonStyle}" />
            </Grid>

            <!-- Splitter -->
            <Rectangle DockPanel.Dock="Bottom" Fill="Gray" Margin="8" Height="1" />

            <!-- Right side buttons -->
            <StackPanel DockPanel.Dock="Right" VerticalAlignment="Bottom">
                <Button Command="Input:TipOfTheDayCommands.ShowNextTip" Style="{DynamicResource FixedSizeButtonStyle}" />
            </StackPanel>

            <!-- Actual tip -->
            <GroupBox Header="Tip of the day" DataContext="{Binding ActiveTipOfTheDay}">
                <Grid>
                    <!-- Rounded border that will serve as the mask -->
                    <Border Name="mask" BorderThickness="1" BorderBrush="Gray" CornerRadius="3" >
                        <Border.Background>
                            <RadialGradientBrush RadiusX="1" RadiusY="1" GradientOrigin="1,0" Center="0.9,0.1">
                                <GradientStop Color="White" Offset="0"/>
                                <GradientStop Color="Gray" Offset="1"/>
                            </RadialGradientBrush>
                        </Border.Background>
                    </Border>

                    <!-- Grid that will clip to the border -->
                    <Grid Height="180" Width="360" HorizontalAlignment="Left">
                        <Grid.OpacityMask>
                            <VisualBrush Visual="{Binding ElementName=mask}" />
                        </Grid.OpacityMask>

                        <!-- Row definitions -->
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>

                        <!-- Column definitions -->
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>

                        <!-- Lamp -->
                        <Image Grid.Row="0" Grid.RowSpan="2" Grid.Column="0" Source="/Catel.Windows;component/Resources/Images/TipOfTheDay.png" Stretch="UniformToFill"
                               Height="72" VerticalAlignment="Top" Margin="0,10,0,0"/>

                        <!-- Title -->
                        <Label Grid.Row="0" Grid.Column="1">
                            <TextBlock Text="{Binding Title}" Style="{DynamicResource CaptionTextBlockStyle}" />
                        </Label>
                        
                        <!-- Description -->
                        <Label Grid.Row="1" Grid.Column="1">
                            <TextBlock Text="{Binding Description}" TextWrapping="Wrap" />
                        </Label>
                    </Grid>
                </Grid>
            </GroupBox>
        </DockPanel>
    </Grid>
</Window>