How to enumerate specific file types in MFC Shell List control?

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C++

Hi,
I have made a image viewer for my study.
I put a MFC shell tree control and MFC shell list control in my project
and it works ok.
Only folders are shown in MFC shell tree control and all files are in MFC list control..

i wonder how to enumerate only image type files(.jpg, .bmp, .gif, .png)
is there any functions available?

this is my code for the controls(tree one and list one)

m_shellTree.Expand(m_shellTree.GetRootItem(), TVE_EXPAND);
m_shellTree.SetRelatedList(&m_shellList);