how to refer main form when in popup?

[Guest]

On my main form (frmReportClient), I have a list box(lstConfirm). On its
dblClick event, I have:
DoCmd.OpenForm "frmReportClientDetails"
which will open this popup form.
In the form_load I have

txtKey = Forms!frmReportClient!lstConfirm.columns(1)

I got object doesn't support this property or method run-time error 438.

Can somebody help me with right syntax?

Thanks!

 

[Brendan Reynolds]

It's 'Column' not 'Columns' - there's no 's' at the end.