emphasise when hovering over an object

Only recently started using articulate so I am probably missing something. However, I want the button to glow when the mouse hovers over. So far I have tried using two objects one normal and the other glowing. I change the state of one object to hidden when the mouse hovers over but when I move the mouse away, I expect it to go back to normal or to show the un-glowing object. This doesn't happen.

Not holding my mouth right, I suspect. Any help much appreciated

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