Relation between args and table buffer and formdatasource and Get menu item name from formRun and elements

 FormDataSource = _args.caller().datasource();

TableBuffer = FormDataSource.cursor();

TableBuffer = _args.caller().datasource();.cursor();

Get menu item name from formRun and elements

if (element.args().menuItemName() == menuitemdisplaystr(YourFormMenuItem))

FormRun formRun = sender.formRun();

formRun.args().menuItemName()