I just understood why this.dataSource is uninitialized. It's because 
there's no subscription yet. So I thing I'm doing it wrong. Could someone 
tell me how to generate an observer without using Subject (which seems to 
be a bad practice).

I created a new plunkr <http://plnkr.co/edit/iamWV1t7AFcd7RnbUrCB?p=preview>, 
in this one I have a component which subscribe to the observable, but I can 
show/hide the component (with ngIf). I don't understand why when the 
component is recreated, the subscription does not retrieve automatically 
the last data ? 

I though Observable should behave like promises, once already resolved the 
last value is automatically retrieve on any new subscriptions.

Thanks.

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