<nButtonID>

A numeric value which is the item ID (command identifier) of an existing toolbar button.

<oMenu>

A menu object. The specified menu will be poped up directly near the toolbar button.

[<nMenuIndex>]

Specifies the number of the sub menu which should be displayed.

Also <nMenuIndex> can be a PTR value.

In this case it specifies a menu handle of of one of the sub menus of the specified menu.

[<symTB>]

The symbolic name of the toolbar. Default is #MainToolBar.