Required library edition:
Required library file: dhtmlxtoolbar.js

adds a listed option to a select button

• parentId - id of a select button
• optionId - id of a listed option
• pos - position of a listed option
• type - type of a listed option (button|separator)
• text - text for a listed option
• img - image for a listed option

    toolbar.addListOption(parentId, optionId, pos, type, text, img);