Quick question - making button visible if two conditions are met

I simply want a button to be visible is once condition is true and another condition is false. Shouldn't this line of code work?
<mx:Button id="Btn"label="
Submit"color="
#FF0000"enabled="
{islRequired}" visible="
{!.isAdmin} {isRequired}"
click="submit()"
/>
isadmin = false
isrequired = true
the button should be visible
Am I missing something?

Maybe you miss OR (||) or AND (&&), but I never use at mxml
visible="{!.isAdmin && isRequired}"
Works?
Best Regards,
Miguel

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Quick question - making button visible if two conditions are met

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