osoft.com/winfx/2006/xaml"
&gt;
   &lt;UserControl.Resources&gt;
       &lt;Style x:Key="NewStyle" TargetType="Control"&gt;
           &lt;Setter Property="FontFamily" Value="Arial"/&gt;
           &lt;Setter Property="FontSize" Value="30"/&gt;
           &lt;Setter Property="Height" Value="40"/&gt;
       &lt;/Style&gt;
   &lt;/UserControl.Resources&gt;
   &lt;StackPanel x:Name="LayoutRoot" Background="White"&gt;
   &lt;RichTextBox IsReadOnly="True" Name="rtb" FontFamily="Algerian" FontSize="20"&gt;
      