SDK - meta_data in SAP UI5 component

Hello,

Does anyone know how to populate "meta_data" in a SAP UI5 based componed?

contribution.xml, has databound = true, and sapui5 as handler type.

<component  id="myid"  title="myComponent"  icon="res/icon.png"  handlerType="sapui5"  databound="true"  group="sapui5">
...</component>

component.js

...
initDesignStudio : function() { 
try {   var that = this;   // no meta_data available ??  this.attachChange(function() {           that.fireDesignStudioPropertiesChanged(["selectedValue"]);           that.fireDesignStudioEvent("onchange");   });   } catch (e) {           alert(e);  } 
...