Hello everybody! I would like to display some polylines in an IDLgrView using an IDLgrROI. My xyz data for the vertex are set when i create the object, using syntax done on the help : Obj = OBJ_NEW( 'IDLgrROI' [, X[, Y[, Z]]] [, PROPERTY=value]) But later, i need to update data values, adding vertex or modifying others, the IdlgrROI->SetProperty do not let the users to modify the original value. I need to destroy and recreate the IdlgrROI object to display the new values of Data. Thanks for your help