I asked it already at 06/04/2012 but maybe you have not seen it:
http://www.west-wind.com/wwThreads/default.asp?Thread=3IO0AYXEW&MsgId=3IO0AYXEX
I set ControlSource between quote and it runs now:
this.txtKeyField.ControlSource="this.Page.oBusiness.oData.Field1"
Thank you