Mask a layer with the layer underneath it in Adobe Fireworks

In Photoshop there is a handy tool that lets you mask a layer with the layer below it. So that the layer above is only visible if the layer underneath has content underneath. The hotkey is ctrl+alt+g i’ve been looking for a similar feature in Fireworks but can’t seem to pull it off.

Anyone know how?

Thanks

Check this out: http://help.adobe.com/en_US/fireworks/cs/using/WS4c25cfbb1410b0021e63e3d1152b00d169-7fec.html Is it what you’re after?