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Select Method (IToolBar)
Selects the specified item in this menu. Do not invoke on a toolbar.
Remarks

Only visible items can be selected. You can use ShowDropdown(String) or ShowDropdown(Int32) to make the button visible.

C# Syntax

    void Select(
       string itemPath
    )

Parameters

itemPath
  The full path of the menu item is a list of menu button names separated by semicolons.