#### Bug, feature request, or proposal: Bug #### What is the expected behavior? Do not execute submit when selecting datepicker button. #### What is the current behavior? When the datepicker button is selected, the form submit is executed. #### What are the steps to reproduce? https://plnkr.co/edit/B2zJloz3J8IhRU6vWZQw 1º) Click in Launch dialog button. 2º) Click in datepicker button. 3º) The value of selectedOption will be 'Option 3' (ngSubmit value) #### What is the use-case or motivation for changing an existing behavior? When i built a dialog to insert data, this happened. #### Which versions of Angular, Material, OS, TypeScript, browsers are affected? #### Is there anything else we should know?