tabindex doesn't work on md-checkbox

Bug, feature request, or proposal:

I am not able to disable tabbing to a md-checkbox.

What is the expected behavior?

<md-checkbox tabIndex="-1"></md-checkbox> should not be skipped over when tabbing through a form.

What is the current behavior?

The checkbox receives focus when tabbing through the form. In addition, there isn’t any visual indication that the checkbox has focus, so it’s difficult to tell where I am in the form unless I press the spacebar to toggle that particular entry.

What are the steps to reproduce?

http://plnkr.co/edit/0P5w3xAmYWhx4ZrEoWUU?p=preview

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

I have checkbox that I want on the form, but not to be tabbed to.

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

Tested on Angular 2.4.8, Angular/Material 2.0.0-beta.2, Chrome

Is there anything else we should know?

That more or less covers it.

[devversion]

Not sure. I see that it can cause confusion here, but I think the tabIndex is in camel-cause because when using an input binding, you are actually setting the native tabIndex property.

That’s why for native inputs you can also do

<input [tabIndex]="2">

Not sure if we should support both.

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