How to set GObject and subclass types property in gst-launch cmdline

Example 0

gst-launch-0.10 playbin2 uri=file:///home/heiher/movies/a.rmvb \
video-sink="fakesink"

Example 1

gst-launch-0.10 playbin2 uri=file:///home/heiher/movies/a.rmvb \
video-sink="ffmpegcolorspace ! xvimagesink"

Over!