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widget to select variable

I am searching for a widget that will let you select a variable, just as
dialog_pickfile lets you select a file.  I would like to be able to select
a variable from the current workspace or from a save file.  Does such a
beast exist?  Insight has a widget which lets you import IDL variables,
but I could not find the source.  I have some vague ideas of how it could
be done, but I'd rather avoid the pain.

Paul Woodford