title: C# WPF window not displaying elements
body: <p>Im playing with WPF in Visual Studio, and I have this weird problem. I have made a grid which takes about 50% of the main window. This grid will be a place where my Tetris game takes place. On the other half of window Id like to display labels showing score and so on. But nothing shows up, just the grid content. Does anyone have any idea what might cause this issue ? 
  Heres my xaml code:</p>
  
  <pre><code>&lt;Window x:Class="Tetris_Final.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:Tetris_Final"
      mc:Ignorable="d"
      Title="MainWindow" Height="500" Width="500" KeyDown="Window_KeyDown"&gt;
  &lt;Grid x:Name="GridPlayBoard" Width="255" Height="405
        " HorizontalAlignment="Left" VerticalAlignment="Top" Margin="5,5,0,0"&gt;
      &lt;Button x:Name="button" Content="Start game!" HorizontalAlignment="Left" Margin="337,148,-177,0" VerticalAlignment="Top" Width="95" Height="48"/&gt;
      &lt;Label x:Name="label" Content="Label" HorizontalAlignment="Left" Margin="337,48,-214,0" VerticalAlignment="Top" Width="132" Height="42"/&gt;
  &lt;/Grid&gt;
  </code></pre>
  
  <p></p>