Change color only for user defined function/class identifier

Hello,

The way to override default syntax highlighting from a lexer in SyntaxEditor is to use classification tags.  You effectively make a new IClassificationType that is associated with an IHighlightingStyle in the style registry.  The style would have an alternate foreground color to be used for the text.  Then you make a tagger that applies that IClassificationType over various appropriate text ranges that should receive that alternate foreground color.  Some of our adornments-related samples show the concept of classification types.  The tricky part of the whole thing is knowing where those identifiers are, so that you can tag the text ranges.