Custom shape changes color

[Abe Gillespie]

I created a measure tool and use the following layer for the lines:

  LAYER
   NAME "custom_solid_line"
   STATUS ON
   TYPE LINE
   POSTLABELCACHE true
   CLASS
        SYMBOL "solid"
     COLOR 255 255 0
        SIZE 2
   END
  END

I add lines to the map with code similar to the following:

$line = ms_newLineObj();
$line->addXY($x, $y);
$shp = ms_newShapeObj(MS_SHAPE_LINE);
$shp->add($line);
$layer = $map->getLayerByName("custom_solid_line");
$retVal = $layer->addFeature($shp);
$shp->free();
$line->free();
// Draw the map later on ...

The problem is the lines don't always stay yellow.  I've seen them
green and pinkish too.  The color seems to depend on other visible
layers.  I've also seen the same phenomenon with the extents box in the
reference map.  In fact, the color of the lines and the extent box is
always the same.  I.e.: when one changes color the other does too.  I
do draw my reference map in a sort of nonstandard way though by drawing
the map and ref. map separately and then pasting them together.

Thanks for any help.
-Abe
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