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How do I hide something when any popup on a page appears?

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The "-hide" hint added to a layer will cause the layer to hide when any popup appears on a page.

If a page has three "-button" layers with popups and two "-button" layers with no popups, the three buttons with popups will cause any "-hide" layers on the page to disappear as long as the page user continues to hover the mouse over the button.

No name matching is required as long as the layer to hide's name ends with "-hide".

This is very useful when your popups appear in the same area of the page as another layer. If the popup doesn't completely obscure the other layer and you don't want the non-popup to be visible while the popup is up, just add the "-hide" hint to it!

Note that this hint is general. It works whenever any popup appears. If you'd rather have a layer disappear only when a very specific button is rolled over, use the "-popdown" hint.