How to find or search for different classes and methods or fields of class

Like in Help file we can see the different classes, methods, events and fields related to a particular class. But they dont cover all the methods, classes and events.

For example: Call Method Grid->Refresh_table_display is available and can be found in help file of SAP, but method Call Method->Check_changed_data is not available in SAP Help File... I came to know about this method through SDN: By Posting a thread and getting my query solved.

Whatz the process of seeing or understanding the different classes, fields and events related to it.