How to Create an Undo transation in Illustrator C++ plug-in?

Hi,

I'm trying to determine how to create an undo transaction in an Illustrator C++ plug-in so that clicking Edit > Undo in the menu undoes the operation.  The undo transaction is created automatically if the functionality is called from a menu item created by the plug-in or from a tool created by the plug-in as long as the edits are performed in one of the mouse event handlers or the EditTool event handler; however, outside of these two scenarios, an undo transaction is created. I tried to create an undo group by pushing an AIAppContext as shown below but it didn't work.

AIAppContextHandle appContextHandle;
err = sAIAppContext->PushAppContext(message->d.self, &appContextHandle);
sAIAppContext->SetAppContextKind(kAIAppContextUndoRedoKind);
AIBoolean prevState;
sAIAppContext->AllowAllChanges(1, &prevState);

<perform edits>

sAIAppContext->PopAppContext(appContextHandle);

 Can you please shed some insight on this?

Thanks,

Martin