Are you aware of alt+m? (List Methods in file) That dialog is capable of listing methods and more. If you right-click over the listbox, you can enable additional items, such as members. This listbox is filterable similarly to alt+shift+s and alt+shift+o (open symbol in solution, open file in solution) dialogs.
What is missing from the Alt-M list in these files? Is it functions, or something else? Once you have opened the Alt-M list you can right click into this list, and the right click menu offers options to include or exclude certain items, for example defines, events, properties and regions. So if it is one of these items that is missing from the Alt-M list, you can turn on showing them via the right click menu.