sSource = oAlItem.Source
Macro expression can be used for input ($.text ..) (it is evaluated while the window is opening). Caution: Macro expression $vb cannot be used for input. Macro expression $.text it can be used both for configuration in the development environment, or in the running application by writing into this property. This enables alarm item texts localization. In this property and on the disk in alarm history the corresponding macro expression is saved (not the macro expression result). It is then possible in the application to switch the language while viewing the alarm history and the alarm item texts will be displayed in selected language.
var oAl = pMe.Pm("/Alarm");
var oAlItem = oAl.Item("Temperature");
var sSource = oAlItem.Source;