WPF - can't see a button in th View design <p>I wrote a simple WPF window that shows a customers grid.</p> <p>in the bottom of the grid I added a button "Add a new Customer, but it blended into the background of the window, and I can't see it in View design.</p> <p>this is the code:</p> <pre><code>&lt;Window x:Class="NihulMlay._1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title=" Customers " Height="120" Width="600"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="300" /&gt; &lt;ColumnDefinition Width="300" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="40" /&gt; &lt;RowDefinition Height="40" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Button FontWeight="Bold"&gt;Customer name&lt;/Button&gt; &lt;Button Grid.Column="1" FontWeight="Bold"&gt;Name&lt;/Button&gt; &lt;Label Grid.Row="1"&gt;&lt;/Label&gt; &lt;Label Grid.Column="1" Grid.Row="1"&gt;&lt;/Label&gt; &lt;Button Grid.ColumnSpan="2" Content="Add a new Customer" HorizontalAlignment="Left" Height="100" Margin="270,114,0,-173" Grid.Row="1" VerticalAlignment="Top" Width="75"/&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>thanks.</p>