title: I Don't want message "SELECT DATE" in DatePicker
body: <p>I don't want display "Select Date" in textbox of DatePicker but I want see something like this <strong>/</strong>/____ or another text.</p>
  
  <p>This is my RESOURCE</p>
  
  <pre><code>&lt;ResourceDictionary
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&gt;
  
  &lt;Style x:Key="ABC" TargetType="DatePicker"&gt;
      &lt;Setter Property="Foreground" Value="#FF333333" /&gt;
      &lt;Setter Property="IsTodayHighlighted" Value="True" /&gt;
      &lt;Setter Property="SelectedDateFormat" Value="Short" /&gt;
      &lt;Setter Property="Background" Value="Transparent" /&gt;
      &lt;Setter Property="DisplayDateStart" Value=" 01/01/1990" /&gt;
      &lt;Setter Property="DisplayDateEnd" Value="12/31/2090" /&gt;        
      &lt;Setter Property="Padding" Value="2"/&gt;
      &lt;Setter Property="FontFamily" Value="Verdana" /&gt;
      &lt;Setter Property="FontSize" Value="14" /&gt;
  
      &lt;Setter Property="BorderThickness" Value="1" /&gt;
      &lt;Setter Property="HorizontalContentAlignment" Value="Stretch" /&gt;
      &lt;Setter Property="HorizontalAlignment" Value ="Center" /&gt;
      &lt;Setter Property="VerticalAlignment" Value= "Center" /&gt;
  
      &lt;Setter Property = "Text" Value="{x:Null}" /&gt;
      &lt;Setter Property = "SelectedDate" Value="{x:Null}" /&gt;
  
      &lt;Style.Triggers&gt;
          &lt;Trigger Property ="IsMouseOver" Value="True"&gt;
              &lt;Setter Property= "Background" Value="Coral"/&gt;
          &lt;/Trigger&gt;
  
          &lt;Trigger Property="IsFocused" Value="True"&gt;
              &lt;Setter Property= "Background" Value="LemonChiffon"/&gt;
          &lt;/Trigger&gt;
  
      &lt;/Style.Triggers&gt;
  &lt;/Style&gt;
  </code></pre>
  
  <p></p>