The purpose of this text is to attempt to answer the incessant queries on coloring text in RichTextBoxes. There is no magic command to do so, unless of course you have purchased a third party control ...
WPF, as previously described, is a fusion of XAML (markup) and C#/VB.NET/any other .NET language. While you can edit all of it in any text editor, even Notepad included in Windows, and then compile it ...