title: combobox windows phone 8.1 no dropdown
body: <p>I add a ComboBox in XAML for Windows Phone 8.1 in a StackPanel. On Running the app in the Emulator no Dropdown functionality is shown. If I Limit the StackPanel to a Height e.g. "70", only the 2 first Items are shown. If I say Height = "Auto" then all Items are shown immediately.</p>
  
  <p>How can I enable the Dropdown functionality?</p>
  
  <p>Header:</p>
  
  <pre><code>    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
  xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  </code></pre>
  
  <p>Combobox ..</p>
  
  <pre><code>&lt;StackPanel Grid.Row="4" Width="350" HorizontalAlignment="Left"&gt;
              &lt;TextBlock x:Name="PlayerListPanel" TextWrapping="Wrap" Text="Select a Player" VerticalAlignment="Center" Margin="2,0,0,0"  HorizontalAlignment="Left"/&gt;
              &lt;ComboBox Name="StartPlayerComboBox" BorderThickness="1" &gt;
                  &lt;ComboBoxItem Tag="PLAYER1"&gt;Player 1&lt;/ComboBoxItem&gt;
                  &lt;ComboBoxItem Tag="PLAYER2"&gt;Player 2&lt;/ComboBoxItem&gt;
                  &lt;ComboBoxItem Tag="PLAYER3"&gt;Player 3&lt;/ComboBoxItem&gt;
                  &lt;ComboBoxItem Tag="Dummy1"&gt;1&lt;/ComboBoxItem&gt;
                  &lt;ComboBoxItem Tag="Dummy2"&gt;2&lt;/ComboBoxItem&gt;
                  &lt;ComboBoxItem Tag="Dummy3"&gt;3&lt;/ComboBoxItem&gt;
              &lt;/ComboBox&gt;
          &lt;/StackPanel&gt;
  </code></pre>