If you want to specify the window class to be opened, use the Create() method instead.
Name of the Related Window class you want to open. If no name is specified, a Related Windows List dialog is opened to let the user choose which related window to open. This is also the default behavior of the Related List function (in Box menu and under F9 key).
Table (Info Box).
WindowCreateRelated() cannot be created if parent is in query mode.