Space requirement of invisible elements

[jody <jody xha gmail com>]

Hi

I have a Gtk::Table in which some Elements (Labels, Entries) have to be hidden,
when a particular CheckButton is activated.

The way it is now, the entire Table varies wildly in its extents when
i activate or
deactivate the CheckButton.

However, i would like to have a "static" layout, where the particular Widgets
smiply become invisible, without the rest of the Widgets being shifted around.

Is there some way to tell the Table to consider the invisible Elements
for its calculations?
(Or some other way to achieve my goal?)

Thank You
  Jody