[OpenLayers-Users] feature doesn't change color on click?!

[zach cruise]

for wfs/gml layer:

when i use "...callbacks: { 'over': function }...", the feature
changes color on click as expected.

but when i use "...callbacks: { 'click': function }...", the feature
does not change color on click.

and using the layer's StyleMap({"select":...}) does not help either.