PleasantRustleDll/PleasantRustle/MainWindow.xaml

<Window x:Class="PleasantRustle.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:PleasantRustle"
        mc:Ignorable="d"
        Title="Приятный шелест" Width="800" FontFamily="Monotype Corsiva" MinWidth="890" MinHeight="830">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="100"/>
            <RowDefinition Height="7*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="150"/>
            <ColumnDefinition Width="7*"/>
        </Grid.ColumnDefinitions>
        <Image Source="/Images/Приятный шелест.png"/>
        <StackPanel Grid.ColumnSpan="2" HorizontalAlignment="Center" VerticalAlignment="Center">
            <TextBlock Text="Приятный шелест" FontFamily="Monotype Corsiva" FontSize="35"/>
        </StackPanel>
        <Frame x:Name="frm" Grid.Row="2" NavigationUIVisibility="Hidden" Grid.ColumnSpan="2" HorizontalAlignment="Center"/>
    </Grid>
</Window>