Message Box Help Button

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The Code

MessageBox.Show ("No Room selected", _
"Data Entry Error", MessageBoxButto ns.RetryCancel, _
MessageBoxIcon. Exclamation, _
MessageBoxDefau ltButton.Button 1, _
0, "Ch12ProjHelp.c hm", _
HelpNavigator.K eywordIndex, "Library Room")

opens the chm file but opens the first item in the TOC instead of the
requested item in the Index. What do I need to do to get it to open the
Index item requested.