Cannot downcast IITWindow to IITBrowserWindow in iTunes COM interface.

Question

Actually, what I'd really like is the ability to highlight a playlist, or an artist, or an album, or a bunch of tracks and use right-click to send the information to another application. But as that isn't an option, I've started looking at the iTunes COM interface.
The code I'm trying to run, gets an IITWindowCollection using LiTunes:Windows() and then iterates though these. When it finds either a BrowserWindow, or a PlaylistWindow, I want to do more processing. But I'm unable to downcast the IITWindow object to an IITBrowserWindow.
Here's a snippet of what I'm trying to do:
IITWindowCollection* iIWindowCollection;
long lCount;
hRes = iITunes->get_Windows(&iIWindowCollection);
hRes = iIWindowCollection->get_Count(&lCount);
IITWindow *iITWindow;
ITWindowKind iTWindowKind;
BSTR bstrName;
IITBrowserWindow *iITBrowserWindow;
IITTrackCollection *iITTrackCollection;
for (long i = 1; i <= lCount; i++) {
hRes = iIWindowCollection->get_Item(i, &iITWindow);
hRes = iITWindow->get_Name(&bstrName);
hRes = iITWindow->get_Kind(&iTWindowKind);
switch (iTWindowKind) {
case ITWindowKindBrowser:
// At this point I need to refer to the object as iITBrowserWindow, not iITWindow.
iITBrowserWindow = dynamic_cast<IITBrowserWindow *>(iITWindow);
if (iITBrowserWindow) {
hRes = iITBrowserWindow->get_SelectedTracks(&iITTrackCollection);
break;
case ITWindowKindPlaylist:
break;
When I run it, I get an exception on the dynamic_cast.
What am I doing wrong here, as I can't see why this shouldn't work.
Or is my lack of C++ knowledge that obvious. <GRIN>.
Cheers.

Answer 1

Ha. I was partly right with my comment about lack of C++ knowledge. It turned out to be a lack of knowledge on how Windows COM works.
In case anyone else runs into this, and finds this thread, (Yeah, right. LOL) here's the answer.
You can't just "cast" from one object to another. You have to use the IUnknown::QueryInterface function to get the pointer to the new Object.
Easy when you know how, not !!!!!
Now onto other questions about how to access parts of the UI through this interface.
Cheers.