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GetGValue()
Return the green component of a colour
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Syntax
GetGValue( <nColour> )   -->   nGreenValue

Arguments
<nColour> is a colour value (such as those produced by the
RGB() macro).

Returns
The returned value is the green part of the colour, and is an
integer in the range 0-255.  Zero (0) corresponds to no green
component, and 255 to a solid green.

Description
In Windows, colours are described by their red/green/blue
(RGB) components.  This function picks out the green component
of a colour.

Example
? GetGValue( RGB( 201, 202, 203 ) )     // Result: 202