Emitting event on model change

[aminebizid]

This is just for discussion.
Do components have to emit changes if the viewmodel changes.
As example
<md-checkbox [(ngModel)]="myValue">
If i check (using the mouse) the checkbox, it's normal to get an event emitted with the value of the change.
But if I fo progamatically do this.myValue = true; Do the checkbox have to emit an event?

[fringd]

+1 this is causing a bug for my when I attempt to implement hierarchical checkboxes.

checking all of the boxes causes the parent box to become checked, all good.

but unchecking a single box cases the parent box to become unchecked, which fires an event, which causes all of the boxes to become unchecked. not good, and also causes a devmode value changed after change detection exception.

[jelbourn]

@fringd should be fixed in checkbox in the latest release. The fix needs to make its way to other components. The gist is that controls should only fire a change event when they have focus. Closing this into #791

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