get_control_binding

Gets the control binding that was created for the specified child property of the track element using set_control_source.

The given property_name must be the same name of the child property that was passed to set_control_source.

Parameters:

this	A TrackElement
property_name	The name of the child property to return the control binding of

Returns:

The control binding that was created for the specified child property of this, or null if property_name does not correspond to any control binding.