OHV/Dev/OHV/OHV.Vehicle/MainWindow.xaml

<Window x:Class="OHV.Vehicle.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:OHV.Vehicle"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True"
        mc:Ignorable="d"
        Title="{Binding Title}" Height="1000" Width="1280">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1*"/>
            <ColumnDefinition Width="1*"/>
        </Grid.ColumnDefinitions>

        <TextBlock ><InlineUIContainer>
            </InlineUIContainer></TextBlock>
        <Button Content="Button" Height="30" Width="65" Command="{Binding TestCommand}"/>

        <ContentControl Grid.Column="1" prism:RegionManager.RegionName="IOView" />
    </Grid>
</Window>