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I don't know exactly, what jainpank means with "Outlook toolbar button style".
If it is like the following, then let me mention that it's great that you working on it. Let us know soon, when we may use it. If not - this is my product suggestion...
Eclipse has combined toolbar-buttons which has a drop-down-component and an action-component (like normal toolbar buttons). The drop-down shows a menu (like JMenu) with submenus a.s.o.
Also there is another feature in that eclipse toolbar button: the common action-component of that button performs - if clicked - always the last performed action which is the last selected action of the drop-down-menu.
could you implement a method or a constructor value to choose this feature in your toolbar buttons too?
Thanks in advance
Robert