AX2012 Custom Lookup on a Dialog

dialog

protected Object dialog()
{
    Dialog                      dialog;
    FormStringControl           control;
    DialogField                 fieldLookup;
 
    dialog = super();
 
    // Dialog Title
    dialog.caption("Aif Adapter");
 
    // Field - EDT, Label
    fieldLookup = dialog.addField(extendedTypeStr(AifAdapterName), "AifAdapterName:");
 
    // Get control
    control = fieldLookup.control();
 
    // Override lookup method
    control.registerOverrideMethod(methodStr(FormStringControl, lookup), 
                                   methodStr(DialogLookup /* Class name */, 
                                             lookup /* Method name*/), this);
 
    return dialog;
}