How to bind a control's property to a path of entity set?

Hi guys,

I'm developing a custom control which accepts an array of objects as input. property abcs is the property which accepts the data.

    metadata: {        properties: {            abcs: {                type: "object[]",                defaultValue: []            }          }     }

Imaging the following odata entity definition(I've simplified the xml to make it easier to understand).

            <EntityType Name="Abc">                <Property Name="Key">                <NavigationProperty Name=DefSet" />            </EntityType>

Now I've set the control to oDataModel and bind the abcs property to the path:

        theControl.bindProperty('abcs', {            path: '/AbcSet?$expand=DefSet'        })

But after I call the bindProperty method, odata request is not triggered. So there's only an empty array when I call getAbcs() inside the control.

What's the problem here?

Regards,

Aaron