Syntax highlighting conflict

I'm trying to syntax highlight this expression: x=$\sqrt{\pi }$//N and from various sources I've learned that x (the assigned symbol) belongs to context Global while the Pi and N belongs to System. So I set out to change the style of both using a hodgepodge of tips I gleaned from this StackExchange as well as from StackOverflow.

However, the weird thing is that the style changes do not add to each other. If I change the style of System, any previous style change to Global would be wiped away, and vice versa. In other words, I can have syntax highlighting for either System, or Global, but not both. This could be seen from these screenshots (sorry for the small font, code added):

First line:

SetOptions[$FrontEndSession, 
 "AutoStyleOptions" -> {"SymbolContextStyles" -> {"System`" -> 
      RGBColor[211./255, 54./255, 130./255]}}] (*magenta*)

System Magenta Setting System style: magenta

Second line:

SetOptions[$FrontEndSession, 
 "AutoStyleOptions" -> {"SymbolContextStyles" -> {"Global`" -> 
      RGBColor[181./255, 137./255, 0./255]}}] (*yellow*)

Global Yellow Setting Global style: yellow; when evaluated, previously set System style was wiped out

Could anyone guide me toward getting syntax highlighting for both of them? I really hope MMA has better syntax highlighting on their future releases.

Answer

To prevent your second invocation of SetOptions from resetting the value of sub-option "SymbolContextStyles", you need to set both "System" and "Global" sub-sub-option values at once:

SetOptions[EvaluationNotebook[],   
    "AutoStyleOptions" -> {"SymbolContextStyles" -> 
                             {"System`" -> RGBColor[211./255, 54./255, 130./255], 
                               "Global`" -> RGBColor[181./255, 137./255, 0./255]}}]

Note: Replace EvaluationNotebook[] with $FrontEndSession to make the new setting effective for all notebooks in the current MMA session, and with $FrontEnd to make them apply to current and later sessions.

This setting works as expected on my Windows 8 (64bit) system with Version 9.0.1.0.

enter image description here

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