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So in order to change it I have to actually change the color.....too bad
certain colors generate them.
FWIW, the reason is because the basic 5250 data stream has only one byte 
for the display attribute. On monochrome displays, the bits are for 
column separators, blinking, underlines, high intensity and reverse image, 
plus 3 bits that are always 001 to indicate that it's an attribute.
When they added color support, they reused this same byte, but had it 
indicate colors.  The bits that indicate yellow happen to also indicate 
column separators.
Later they added extended attribute support, but not all terminals support 
it, so the basic attribute byte is still the primary one in use for 
everything.
It's one of the many limitations of the 5250 protocol.

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