How delete worksheet in Vaadin 7 Spreadsheet?

am using Vaadin 7 Spreadsheet 1.1

The + control enables user to add a worksheet.
How can the sheet be removed?
The method to call would be deleteSheet(index) - where index is active sheet index.

Is there a control to delete sheet?
Can a right-click (context menu) be added to the tab?
Can a closeable listener be added to the tab?
Can an action (context menu) be added to a spreadsheet action handler (in addition to the default action handler)?

Thank you