Sorry for this stupid questions, but I’ve never developed COM components. I try to learne interaction between .net and COM though I need to create COM. Questions:
1)Why “STOP” sign appear in solution explorer when I am create COM project in VS2010 using ATL wizard(look at image)?

2)How can I add my own class for this project?
3)Where can I search simple tutorial for beginners?
Because those are supplementary “Generated Files”, they are excluded as not necessary for the build (unless another source file references them explicitly, of course). Stop sign means “excluded”.
Adding an ATL Simple Object on MSDN
ATL Concepts and Tutorial, CodeProject