Add project files.

WpfDemo/MainWindow.xaml

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+<Window x:Class="WpfDemo.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:WpfDemo"
+        mc:Ignorable="d" FontSize="24"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="auto"/>
+            <ColumnDefinition Width="*"/>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*" />
+            <RowDefinition Height="auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+        <StackPanel Orientation="Vertical" Grid.Row="1" Grid.Column="1">
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="FirstName" Margin="5" />
+                <TextBox x:Name="firstname" d:Text="Tommy" Width="100" Margin="5" />   
+            </StackPanel>
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="LastName" Margin="5" />
+                <TextBox x:Name="lastname" d:Text="Öman" Width="100" Margin="5" />
+            </StackPanel>
+        </StackPanel>
+    </Grid>
+</Window>