AutosizeHeight and run-time value

I know this has been asked many times before, but my Google-fu has failed me.
PowerBuilder 12.5.2 classic mode, running on Win7 64 bit.
I have an autosize height column in a datawindow, and I want to know how tall it has become after I set a value to it (to account for word/line wrapping, etc.). There is only one row in the datawindow at a time.
I have tried dw.Describe(ColumnName + ".Height"), and I get the design-time value.
Tried dw.Describe("Evaluate('" + ColumnName + ".Height', 1)"), get an invalid expression error.
Used RowHeight(), but it seems to increment sporadically (every 5-12 lines).
Even put an invisible line under the column with SlideUp, and looked at the Y1 value, but again only get the design time value.
Help?
-Kennon

Aha.
The RowHeight() expression was the trick, BUT
I have several autosize columns stacked below the one I'm interested in. They were uninitialized (null actually), and had zero(!) height at run-time. It seems that the row autosize "reserved" enough room for the design-time height, and once a column took up all the phantom allotted space, then the row would resize. Took off autosize on the other columns, and hey presto.
I am now a bit more bald, but good golly the dang thing works.
Thank you both for your help.
-Kennon

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