jQuery Grid Plugin - jqGrid

Hello,  I'm just starting with jQuery and jqGrid.  I want to use some of the built-in crud operation with jqGrid's dialog, however I think I need to intervene to make the requests to our RESTful web service tier.  Below is an example of how my "new" button is wired up:

 $("#btnNew").click(function(){
                                        $("#dgDocumentCategories").jqGrid("editGridRow","new",{beforeSubmit:addDocumentCategory});debugger});
                                       
                        function addDocumentCategory(params){
                                                    
                            $.ajax({type:"POST",
                                    url:"myurl",
                                    contentType:"application/json",
                                    data:JSON2.stringify(params),
                                    processDate:false,
                                    dataType:"json",
                                    success:function(d,s,r) {
                                                        $("#dgDocumentCategories").jqGrid("setGridParam",{datatype:"json"}).trigger("reloadGrid");
                                                        }
                                    });
                            return [false];           
                        }

this seems to work ok, now I would like to do something with the built-in dialog, either dismiss it, flush it or set the notification message.  Can anyone help me access this object?

Thanks in advance