Sound propeties window problem in VISTA - WDM Audio Driver development

Higroup,

I am working on audio driver development for windows Vista.
I have a problem in dynmaic updation of my audio device changes to the sound properties Window.

I want to send a message/event to the outside world from my driver, so that the application will collect the latest information and updates in its window.
For this i am doing the following changes in my driver.But my changes are not working fine, still after implementing this, I did not find any change in sound properties window.

TARGET_DEVICE_CUSTOM_NOTIFICATION Notification;
Notification.Event = GUID_AUDIO_EVENT; //615FC2B2-330C-11DE-90F4-DF3F56D89593;// new GUID
Notification.Version = 1;
Notification.Size = (USHORT)FIELD_OFFSET(TARGET_DEVICE_CUSTOM_NOTIFICATION, CustomDataBuffer);
Notification.FileObject = NULL;
Notification.NameBufferOffset = -1;

status = IoReportTargetDeviceChangeAsynchronous( AdapterPdo,
&Notification,
NULL,
NULL);

Please let me know the correct procedure to notify my device changes.

Thnaks,
Are