Hi Tanya,
Yes, I've tried by adding "Direct3DWindowClass" class to MSAA but still no luck. Only very few child objects like MenuBar("Aplication"), Client("System Application") and MenuBar('System") are displayed in parent object Window("Direct3DWindowClass","System Application",1) under object browser.
When "Direct3DWindowClass" class added to UI Automation then only parent object is recognized as UIAObject("System_Application") without any child objects
If wndclass is not specified in UI Automation & MSAA then parent object is recognized as Window("Direct3DWindowClass","System Application",1).