Calls the help document with a specific topic.

Public static Function InvokeContextHelp(
    window As IntPtr, 
    contextId As Integer, 
    helpPrefix As string, 
    hlpevent As HelpEventArgs
) As void

public static void InvokeContextHelp(
    IntPtr window, 
    int contextId, 
    string helpPrefix, 
    HelpEventArgs hlpevent
);