<Window x:Class="WPF_3_Grid_BasicResponsiveLayouts.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"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="70" />
            <RowDefinition Height="170" />
            <RowDefinition />
        </Grid.RowDefinitions>

        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>

        <!-- <TextBlock Text="Hello World" /> -->
        <!-- -->
        <!-- <TextBlock> -->
        <!--     <TextBlock.Text> -->
        <!--         Hello World -->
        <!--     </TextBlock.Text> -->
        <!-- </TextBlock> -->

        <Rectangle Grid.Row="0" Grid.Column="0" Fill="Red" />
        <Rectangle Grid.Row="0" Grid.Column="1" Fill="Green" />
        <Rectangle Grid.Row="1" Grid.Column="0" Fill="Blue" />
    </Grid>
</Window>