Any way to know whether the column of matrix is active at run-time?

Hi all,
I have posted similar question earlier but it was for setting the column prefrences . In a system form, I am having some user defined columns to which I am copying some data. If they are not active, and if I try to do
Matrix.Columns.Item("U_STNLineno").Editable = True,
It gives me 'form item is not editable' error.
I can fetch the active status from CPRF table, but it updates the status only after SAP B1 is closed.
If atleast, I know, at run time, tht the column is not active, I can prompt user a warning to make it active from form settings.
But, How do I know whether the column is active or not?
any clue?
Thanks in advance..
Binita

Maybe is better solution, but I`m doing it that I`m trying in system objects to do
Matrix.Columns.Item("U_STNLineno").Editable = True
between try catch statement and if is there any error which contains "editable" sentence, I know that it is`nt allowed.
it should be done as
on error resume next
Matrix.Columns.Item("U_STNLineno").Editable = True
if Err.Description <> "" then
-- cannot set
end if
on error goto 0
Petr

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