title: WPF FlowDocument to InlineCollection
body: <p>I want to create a small in Place Editor in a WPF Application for TextBox Texts. For this I want to use the RichTextBox. As the RichTextBox works with a FlowDocument, and the TextBlock with a InlineCollection, this does not work. Is there a easy way to Convert the RichtextBox Document to a InlineCollection? (If I only allow RTB Content wich is supported in a Inline?)</p>