Julio, you provide the answer to my question, which is “no”. I’m disappointed, 
I must confess.

Everyone, thanks for suggesting workarounds. I hope the ability to specify the 
properties in code will be implemented - and soon!

Jeremy


> On 30 Oct 2018, at 20:10, Julio Carneiro via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> Jeremy,
> 
> I have something similar to what you have, and I use entity selection. Except 
> that I have a single column Listbox already set in the forms where I need 
> them,
> The missing link for a completely dynamic Listbox is the ability to set the 
> “Datasource” properties by code.
> 
> As of V17r2, afaik, those properties must be set via the Form editor.
> Without them you cannot get or set the selected row(s).
> 
> julio


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