Allowing a button only when a tilelist contains elements

In my application, I have a button that pours a tilelist however I want to only be "activated" when this tilelist contains actually the points and off when it doesn't.

Should what code I apply to the next enabled property of the button to make it only be activated when a component tilelist (simply called tilelist1 in this example) contains at least 1 item? :-

enabled = "{tilelist1.}".

enabled = "{tilelist1.rowCount > 0}.

Tags: Flex

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