hidding and showing objects

I'm still finding my feet with storyline so apologies if the answer is blindingly obvious

I have a list of training objectives on my slide. Rather than just have a boring list i thought i would have a button for each with a relevant logo. When the user clicks the button the objective is explained. I achieved this simply using layers, so far so good.

Then i thought wouldn't it be great if once I had viewed the layer the written objective would remain in view and that is where the headache began. I have tried all sorts of trigger variations without success.

Any advice or ideas welcome

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