- Called after value of a child property has been altered. Note that this function is
- usually called at the time that value of this property, or given child property, is
- still pending for change.
+ Called after value of a child property has been altered. Must return
+ new value of the whole property (after any alterations warrented by
+ child's new value).
+
+ Note that this function is usually called at the time that value of
+ this property, or given child property, is still pending for change,
+ and as such, result of GetValue() or m_value should not be relied
+ on.