Oh yes, To remove all items from a tilelist you just use
collection = new ArrayCollection();
In my example the dataprovider is refilled as a proof of concept.
Commenting the line:
collection = new
ArrayCollection([{first:'John'},{first:'John'},{first:'John'},{first:'John'},{first:'John'},{first:'John'},{first:'John'},{first:'John'},{first:'John'},{first:'John'},]);
will result in a clean Tilelist instance ; )
