How to show only open order of sales in MSD axapta

How to show only open order of sales in axapta

 FormCheckBoxControl checkBoxControl = this.controlCallingMethod();  
 QueryBuildRange rangeSalesStatus;  
 Boolean ret;  
 ;  
 ret = checkBoxControl.modified();  
 rangeSalesStatus =  
 SalesTable_ds.query().dataSourceTable(tablenum(SalesTable)).findRange(fieldnum(SalesTable,  
 salesStatus));  
 if (!rangeSalesStatus)  
 {  
 rangeSalesStatus =  
 SalesTable_ds.query().dataSourceTable(tablenum(SalesTable)).addRange(fieldnum(SalesTable,  
 salesStatus));  
 }  
 if (checkBoxControl.value() == NoYes::Yes)  
 {  
 rangeSalesStatus.enabled(true);  
 rangeSalesStatus.value(queryValue(SalesStatus::Backorder));  
 }  
 else  
 {  
 rangeSalesStatus.enabled(false);  
 }  
 SalesTable_ds.executeQuery();