*Hi Andrea. Isn't it more efficient to draw simple sphere than circle? In 
that case you dont have to multiply vectors by matrix every draw update...*
*And instad of MPxDrawOverride, I recoment to use MPxGeometryOverride... 
You can declare couple of MShaderInstance as static variables and use it 
for every locator instance in different cases (selection lead, selection 
active, defoult state). *
*But in that case you will lose your ability to switch color per locator 
instance.*

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