mui.DoMethod(id, "Insert", pos, column1$, ...)
The insert position is specified in the "pos" argument. The new entry will be added in front of the entry specified by "pos". This can be an absolute index position starting at 0 for the first entry or one of the following special values:
If "pos" is bigger or equal to the number of entries in the list, it's
All entries you insert using this method can use text formatting codes. See Text formatting codes for details.