The direction the Expander grows in.
See also:
koui.elements.layouts.Expander
@:value(cast 1)@:impl@:enuminlineread onlyDOWN:ExpanderDirection = 1
@:value(cast 2)@:impl@:enuminlineread onlyLEFT:ExpanderDirection = 2
@:value(cast 3)@:impl@:enuminlineread onlyRIGHT:ExpanderDirection = 3
@:value(cast 0)@:impl@:enuminlineread onlyUP:ExpanderDirection = 0