[Updated] Md-Tabs - Navigate Options & Count Tabs

[Ganim]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

#1 - I would like to change tabs by buttons,
#2 - count how many tabs I have.

What is the current behavior?

tabsNumber = document.getElementsByTagName('md-tab').length;
Doesn´t work to count tabs. If i don´t know how tabs I have, a can´t limite the "Next" Button

What is the use-case or motivation for changing an existing behavior?

Thats a way to navigate better the tabs, and a way to do a multi step form.

Which versions of Angular, Material, OS, browsers are affected?

@angular/material: 2.0.0-beta.1

[Ganim]

[Updated] - Use the template question form, sorry by changed this before.

[andrewseguin]

Here's an example of (1) changing the tabs using buttons and (2) counting how many tabs there are using a ViewChildren query.

http://plnkr.co/edit/cyb5sRINXprP0pwXsCmB?p=preview

Please feel free to open the issue if you find a bug or missing feature

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