or
<ControlTemplate.Triggers> <Trigger Property="EffectiveOrientation" Value="Vertical"> <Setter Property="ColumnDefinition.Width" TargetName="HeaderColumn" Value="Auto"/> ...

<RichTextBox Margin="22,38,108,124" Name="richTextBox1" IsDocumentEnabled="True" > <FlowDocument> <Paragraph> <Bold>Hi</Bold> Welcome to Semanticspace <Hyperlink NavigateUri="http://www.semanticspace.com" RequestNavigate="Hyperlink_RequestNavigate" >Semanticspace </Hyperlink> </Paragraph> </FlowDocument> </RichTextBox>private void Hyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e) { System.Diagnostics.Process.Start("IExplore.exe", e.Uri.ToString()); }