Thanks Arthure , the first solution works perfectly fine!!

El miércoles, 4 de mayo de 2016, 17:40:23 (UTC-3), Gonzalo Tirapegui 
escribió:
>
> Hi , in your core-drag-drop functions (implemented on polymer 0.5) as you 
> can see in this source 
> <https://github.com/Polymer/core-drag-drop/blob/master/core-drag-drop.html> , 
> line 35-37 the polymer component (as i understand) observes the x and y 
> property of itself and it call to the coordinatesChanged method to execute 
> it , when you search in the migration guide you say "Unlike Polymer 0.5, 
> observers do not support the this.$.elementId syntax for observing 
> changes to the properties of local DOM children. However, in some cases you 
> can use data binding to bind a property to the child element’s property, 
> and observe the local property instead." , so , how you can observe the 
> same property (on Polymer 1.0) if you can't reference it?
>

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