datepick doesn't work properly in form

[ghost]

Bug, feature request, or proposal:

bug

What is the expected behavior?

when i click the calendar button, pop up the calendar,and select the date

What is the current behavior?

when i click the calendar button, the form ngSubmit function will be exec

What are the steps to reproduce?

just put a Datepicker component in form

<md-dialog-content>
    <form (ngSubmit)="onSubmit()" #dialogForm="ngForm"> 
        <md-input-container>
            <input mdInput [mdDatepicker]="myDatepicker" name="mydatep">
            <button mdSuffix [mdDatepickerToggle]="myDatepicker"></button>
        </md-input-container>
        <md-datepicker #myDatepicker [touchUi]="true"></md-datepicker>      
        
        <md-dialog-actions [attr.align]="actionsAlignment">
            <button md-raised-button color="primary" md-dialog-close (click)="dialogClose()"> Close </button>
            <button type="submit" md-raised-button color="accent" [disabled]="!dialogForm.form.valid"> OK </button>
        </md-dialog-actions>   
    </form>
</md-dialog-content>

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

It isn't working properly in form, and it is work properly outside form

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

Angular 4.2.0-beta.0
material 2.0.0-beta.5
os win10
typescript 2.3.1
Browsers: Chrome 58.0.3029.110 (64-bit)

Is there anything else we should know?

[yoanasdrubal]

I Fix that problem using type attribute in button date picker
<button type="button" mdSuffix [mdDatepickerToggle]="picker">

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