Do forms use a two pass rendering system? Does Something like Microsoft's DesiredWidth/Heigh exist?

Basically I need a way to make a uniform width and height amongst multiple items and in Microsoft's XAML where we had the measure pass and arrange pass we could do this via the DesiredSize and then set sizes accordingly. Is there a way to get an items desired size regardless of it's Width/Height, RequestedWidth/RequestedHeight properties?

Thanks,
Brad