Multiple Tabs are not visible

```
What steps will reproduce the problem?
1.A excel contains data in multiple tabs
2.only first tab is visible,rest are not .

What is the expected output? What do you see instead?
there should be a tab bar,so that we can switch to different tabs.

Please provide any additional information below.

```

Original issue reported on code.google.com by `soorajsh...@gmail.com` on 21 May 2014 at 12:45

Start by reproducing the problem with an Excel file containing multiple tabs, then trace how the reader handles workbook sheets and exposes the first tab. The issue is done when the output includes a tab bar and users can switch among all available tabs.

Written by the indexing model from the issue text.