I'm using: Angular 4.0 and for material: https://github.com/mseemann/angular2-mdl
The issue is using the Select Component, it always stay open. Doesn't look like it's the proper behaviour.
Looks like this:
Here's the Demo App:
You just forgot to import the Select component css.
In order to import the missing styles, you can add
in your main
If you are using webpack & scss in your local machine, you can import them like this as well