Edin,
So your enhancement request is that the fixed data grid would show itself when a search is exectuted and remain visible until the user mouses over and then out?
Jorge,
There is no way to completely hide the relates tab if you are using the fixed datagrid. There is the disablerelatestabinfixed attribute on the floatorfixed element as covered by the documentation.<floatorfixed disablerelatestabinfixed="true">fixed</floatorfixed>