<Window x:Class="WpfApp1.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:WpfApp1"
          mc:Ignorable="d"
          Title="MainWindow" Height="450" Width="800">

     <Grid ShowGridLines="True" Margin="15 15" >
          <Grid.ColumnDefinitions>
               <ColumnDefinition Width="241*"/>
               <ColumnDefinition Width="314*"/>
               <ColumnDefinition Width="237*"/>
          </Grid.ColumnDefinitions>

          <Grid.RowDefinitions>
               <RowDefinition Height="210*"/>
               <RowDefinition Height="209*"/>
          </Grid.RowDefinitions>

          <Label Content="Hello World!"
               HorizontalAlignment="Left"
               Margin="72,95,0,0"
               VerticalAlignment="Top"/>

          <Button Content="My Button"
                    Grid.Column="1"
                    HorizontalAlignment="Left"
                    Margin="110,95,0,0"
                    VerticalAlignment="Top"
                    Width="75"/>

          <TextBox Grid.Column="2"
                    HorizontalAlignment="Left"
                    Height="23"
                    Margin="66,95,0,0"
                    TextWrapping="Wrap"
                    Text="My TextBox"
                    VerticalAlignment="Top"
                    Width="120"/>

     </Grid>
</Window>

<Window x:Class="WpfApp1.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:WpfApp1"
          mc:Ignorable="d"
          Title="MainWindow" Height="450" Width="800">
    
     <Grid>
          <Grid.ColumnDefinitions>
               <ColumnDefinition Width="340" />
               <ColumnDefinition Width="600" />
          </Grid.ColumnDefinitions>

          <Grid.RowDefinitions>
               <RowDefinition Height="70"></RowDefinition>
               <RowDefinition Height="Auto"></RowDefinition>
          </Grid.RowDefinitions>

          <!-- header -->
          <StackPanel Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="0" Background="lightgray">
               <Label Content="Hello Top"/>
          </StackPanel>

          <!-- left panel -->
          <StackPanel Grid.Column="0" Grid.Row="1" Background="lightgreen">
               <Label Content="Hello1" />
          </StackPanel>

          <!-- right panel -->
          <StackPanel Grid.Column="1" Grid.Row="1" Background="lightyellow">
               <StackPanel Background="lightblue" Height="200">
                    <Label Content="Hello2" />
               </StackPanel>

               <StackPanel Background="MediumSlateBlue" Height="300">
                    <Label Content="Hello3" />
               </StackPanel>
          </StackPanel>
     </Grid>
    
</Window>