I am having some trouble using the GTK Expander widget. I have several expanders in a vertical box. When collapsing an expander, I want the expanders below to "shuffle" up to meet the bottom of the collapsed expander's bar. However, using VBox appears to reserve a fixed amount of vertical space for each widget, which does not change when an expander is collapsed.
As a side note, I am using GTK version 2.14.7. I am using GTK through the Gtk2Hs bindings to Haskell, GHC version 6.10.3, on Windows 7.
When adding the expanders to the vbox use the following snippet
boxPackStart vbox expander PackNatural 0
also make sure that when the vbox was created the homogenous flag is False.
The default packing style is PackRepel which will distribute extra space evenly between child widgets