Is there a way to have property bindings apply in screen space? I'm modeling selection handles, and have them at the top level of the screen over some element deep in the screen. But position properties are their actual x/y values, which doesn't work because it's consistently 0 because of the nesting of containers to get the layout I need.
Yeah, it would be great to use properties from other objects. May be even with some basic math (+, -, /, *) so we could set the relation between two or more properties.