Problem AutoComplete Suggestion

Dear Experts,

I have created one AutoComplete Object as follows

oCB_SO_LensType = new sap.ui.commons.AutoComplete({  editable: true,      selectedItemId:null,  width: '100%',  tooltip: "Enter a name",  maxPopupItems: 10,  displaySecondaryValues: true,  items:{        path:"/E_MaraSet",        template: new sap.ui.core.ListItem({key: "{Matnr}", text: "{Maktx}", additionalText: "{Matnr}"})  },     valueState : sap.ui.core.ValueState.Error,     change: function(oEvent){      searchItemCode = oEvent.getSource();      if(searchItemCode.getSelectedKey()!=null){//GetVarientCode(searchItemCode.getKey()      oCB_SO_LensType.setValueState(sap.ui.core.ValueState.Success);      GetArticlePrice();      oCB_SO_LensSide.focus();      }else{      oCB_SO_LensType.setValueState(sap.ui.core.ValueState.Error);      oCB_SO_LensType.focus();      }     },  });

and the filter as follows

oCB_SO_LensType.setFilterFunction(function(sValue, oItem){  return (oItem.getText().toUpperCase().search(sValue.toUpperCase())!=-1 || oItem.getAdditionalText().search(sValue)!=-1);   });

on poppuing up the suggestion box if i select it through mouse it is giving me the object of combobox which i am using in change event but if select the suggested item using keyboard its not giving me combobox object it is empty i dont know how to handle this situation and i am stuck in it.

Kindly Advise

Rgards

:S