Opening SearchDialog.html from code behing not working

Hi All, we have below code for opening searchdialog.html before aras 11 sp 8 now we have sp 8 , it is not working. any sujjetions??? var params = {aras: top.aras, itemtypeName: 'Identity', itemContext: undefined,itemSelectedID: undefined, var params = {aras: top.aras, itemtypeName: 'Identity', itemContext: undefined,itemSelectedID: undefined, sourceItemTypeName: 'Identity', sourcePropertyName : undefined}; var options = { dialogWidth: 700, dialogHeight: 450 }, dlgRes = aras.modalDialogHelper.show("DefaultModal", window, params, options, "searchDialog.html");