Hi Evelyn,
You wish to delete the features from the feature class or spark control datagrid?
If its the from the feature class then simple pass an array of graphics(each graphic must contain a valid objectid) as the third parameter
in the applyEdits method.
myFeatureLayer.applyEdits(null,null,deleteGraphicsArray,new AsyncResponder(onResult,onFault));
Regards,
Nigel.