Polymer iron-select fires on element load

i have a paper-dropdown-menu inside a repeating template, this dropdown have an on-iron-select event, problem is the event fires for each element being binded on the element load, how can i prevent this.

<paper-dropdown-menu label="Status" required >
   <paper-menu selected="{{item.status}}" id="ddlStatus" attr-for-selected="value" on-iron-select="_statusChanged"  class="dropdown-content">
      <template is="dom-repeat" items="{{statusList}}">
         <paper-item value="{{item}}">{{item}}</paper-item>
      </template>
   </paper-menu>
</paper-dropdown-menu>