I have a windows application. When I select the option one from a combo-box, I bind an UltraGrid control to a DataSet with to DataTables (Maestro and Detalle) and a Relation between them: ds_MaestroDetalle.Relations.Add( "Maestro_Detalle", ds_MaestroDetalle.Tables["Maestro"].Columns["ID"], ds_MaestroDetalle.Tables["Detalle"].Columns["ID"]);Since I want to Export to Excel the info in the two DataTables and the relationship, I use SetDataBindings: this.ug_Reportes.SetDataBinding(ds_MaestroDetalle, "Maestro");Then, when I select the option two from the combo-box, I bind the sameUltragrid to a DataTable. dt_MyTable.TableName = "Maestro"; this.ug_Reportes.DataSource = dt_MyTable;I get the following message when binding to the second option: "Child list for field Maestro cannot be created."I guess, when binding to the DataTable in the second option, UltraGrid is currently looking for Table Maestro in the DataSet (first option).I try to UltraGrid.DataBindings.Clear(), UltraGrid.DataSource = null, but I don't know how to reset UltraGrid to start binding again without problems.Thanks in advanced!