[Vala] about property override.

["readon shaw" <xydarcher 163 com>]

When I inherit from GTK widget, I want to override inherited property, so that the normal operation will not 
be affected. However I could not find any material or tutorials describing it.


when I tried to override property, it seems the compiler will report the error.
but using the keyword reported, 'new', I think it means a totally new property, not override.


is there any example can explain the way it should be?