how to binditems in Select with filteroption

Hi All,

i have two drop down  one for Country and another one for Region based on country selection i want to populate region

below is the Code which i have used in view for Region

<Select id="idRegion">

  <core:Item key="{Key}" text="{Value}" />

  </Select>

Below is the Method is controller to fill region drop down

getRegion:function(oEvent){

  var country = this.getView().byId("select");

  var key = country.getSelectedKey();

  console.log(key);

  var region= this.getView().byId("idRegion");

  var oFilter = new sap.ui.model.Filter('Key',sap.ui.model.FilterOperator.EQ, '+IN +'); 

  region.setModel(oModel);

  debugger;

  region.bindElement({

  path : '/regionSet', 

                 filters : [oFilter]

  });

  },

i am able to call getEntityset method but filter i am getting blank

please suggest me where i am going Wrong.

Thanks

Ashish