Retrieving text from a class

I know how to use WinGetClassList() to return a list of classes in a window.  And I know how to use WinGetText() to return the text in a window.  But how can I get the text from each of the classes that WinGetClassList() returns?  I tried ControlGetText("title", "text", controlID) but it returned a blank string and @error=1, indicating some error.  I'm reasonably sure my input parameters are correct as I used the AutoIt Window Info Tool to obtain each, and those parameters return expected results with other functions.  Thoughts?  Maybe I'm mixing up 'class' and 'control?'