Iam vey new to symbian c++.In my application,I created a Menu and added MenuItems(such as Help,About etc;).When "Help" Menu Item is clicked it must display a Dialog.So,for this i added necessary code in .rss file and in
MyAppContainer.cpp I added the following code.

CAknDialog *dialog = new (ELeave) CAknDialog();

But when I build this Application it is giving an error as
"illegal use of incomplete struct\union\class 'CAkDialog"

What is this Error?Pls reply for this.