UserDialog in STAAD.Pro CONNECT Edition

Hi I am using STAAD.Pro CONNECT Edition (STAAD.Pro Advanced CONNECT Edition - Version 22.00.00.15)

I am using UserDialog Feature and attempting to using DialogFunc event handler which is triggerred 

However I am not able to find user documentation on this, the generated code states this 

Rem See DialogFunc help topic for more information.PrivateFunction StructSelect(DlgItem$, Action%, SuppValue?) AsBooleanSelectCase Action%
    Case 1 ' Dialog box initializationCase 2 ' Value changing or button pressedRem StructSelect = True ' Prevent button press from closing the dialog boxCase 3 ' TextBox or ComboBox text changedCase 4 ' Focus changedCase 5 ' IdleRem Wait .1 : StructSelect = True ' Continue getting idle actionsCase 6 ' Function keyEndSelectEndFunction

Please guide me to correct location on using this feature.