Hi Nick,
thanks for the support but even with that line I can't see the result I 
expected. Basically, when the application starts, if I select a green triangle 
then it should be shown in red, while now it ramains green. (please see 
attached movie). In fact the triangle after picking is moved from primitive set 
1 to primitive set 0. Triangles belonging to primitive set 0 are accociated 
with red color in the color array. It's fine to see the white selector triangle 
"over" the selected triangle but is shoud become red.


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