* added to any bin inside this bin, so it will also be called if a new child
* was added to a sub-bin of this bin. #GstBin implementations that override
* this message should chain up to the parent class implementation so the
* added to any bin inside this bin, so it will also be called if a new child
* was added to a sub-bin of this bin. #GstBin implementations that override
* this message should chain up to the parent class implementation so the