ActiveQt signal not fired to com interface Qt4.8.4

Hello, It seems that signals of QAxBindable are not fired correctly. As it doesn’t work in my own ActiveQt project, I have tested the Qt4.8.4 simple Example (QSimpleAX) in Qt 4.8.4 “Active X Control Test Container” and when I moved slider or changed the text, there is no signal in the application “Signal log”. There is only some property changed in the “Property log”. Signals are reported with other ActiveX server like “Microsoft Text box” I missed something or there is a bug in Qt ? I use Qt 4.8.4 msvc32 on Windows 7 64 Thanks.