This forum is very much alive! You can't be looking hard if you're only seeing old posts. The posts preceding yours are all from the last few days including some others posted today!
Are you referring to a list box? Usually you can just send the text to the list box to select it. See:
http://www.mjtnet.com/blog/2009/07/02/s ... down-list/
You don't say which version of Macro Scheduler you are using. With v12 the way to modify the property of a dialog object (e.g. populate an object's text with the content of a variable) is to simply use the SetDialogProperty function. See the sample macros or search these forums. Plenty of examples exist.
Also see these video tutorials:
With older versions of Macro Scheduler you would need to set the dialog object variables and then call ResetDalogAction. It's more tricky but again plenty of examples exist here. My advice is to switch to v12 as it is *MUCH* more easy and also way more powerful.