WPF RichTextBox: How to change selected text font?

Question

how can I change the font for a currently selected text area inside a WPF RichTextBox?

Answer 1

Solved...

if (this.TextEditor.Selection.IsEmpty)
    this.TextEditor.CurrentFontFamily = SelectedFont;
else
    this.TextEditor.Selection.ApplyPropertyValue(TextElement.FontFamilyProperty, SelectedFont);