When you need some more information about a symbol, such as: base types or members, members of the type, etc., you can find it in the Object Browser window. To open it, use the Navigate to Object Browser feature.
Place the caret at the symbol to be investigated, then
choose corresponding navigation command from the Navigate to context menu.
You can invoke it in the editor, Solution Explorer,
Class View as well as in ReSharper windows.
The corresponding symbol is selected in the Objects pane, its members are displayed in the Members pane, and details on the symbol appear in the Description pane of the Object Browser.