DataBinding for SUB-[object] with bindValue

Hey,

i'm new to the topic UI5. I just test with the demo RMTSAMPLEFLIGHT and output as a table. The output of simple fields such as "fldate" works fine. But how can i access or bind with fields of sub-objects like "flightdetails"

works fine:

          oTable.addColumn(new sap.ui.table.Column({           
                          label: new sap.ui.commons.Label({text: "Date"}),         
                           template: new sap.ui.commons.TextField().bindValue("fldate"),           
                              sortProperty: "fldate"         
           }));

don't works:

          oTable.addColumn(new sap.ui.table.Column({          
                label: new sap.ui.commons.Label({text: "from Country"}),          
                template: new sap.ui.commons.TextField().bindValue( "flightDetails/countryFrom"),          
               sortProperty: "flightDetails/countryFrom"
         }))

On Screen you can see, that the object exist.

It would be nice if someone can help me

Thanks al lot

Danny