function GetGeomExtentsFun(pCustomEntity) {

                var sGuid = pCustomEntity.Guid;
                if (sGuid == "TestMxCustomEntity") {
                    if (!pCustomEntity.IsHave("ept"))
                        return;

                    var stp = pCustomEntity.GetPoint("spt");
                    if (stp == null)
                        return;

                    var ept = pCustomEntity.GetPoint("ept");
                    if (ept == null)
                        return;

                    var ret = mxOcx.NewResbuf();

                    ret.AddPoint(stp);
                    ret.AddPoint(ept);

                    mxOcx.SetEventRetEx(ret);
                }
            }