busyDialog responds to slow

Hi,

I have a sap.m.BusyDialog coupled to my odatamodel using the 'attachRequestSent' method.

var oModel = new sap.ui.model.odata.ODataModel(

                                sServiceUrl, false);

oModel.attachRequestSent(function() {

      busyDialog.open();

});

oModel.attachRequestCompleted(function() {

      busyDialog.close();

});

The dialog shows up to late, when the new data is almost loaded. I want the busydialog to pop up right at the moment when I press the button.

Anyone who can help me?

Kind regards,

RW