Inserting in the middle of a hbox

[Etienne Grossmann <etienne anonimo isr ist utl pt>]

  Hello,

  I would like to know wether it is possible to insert elements at an
arbirtrary (that is, not at the beginning or at the end) position in a
hbox?  

  Also, is there any way to delete an element from a hbox?

  These are a newbie's (to gtk) questions; I don't think the doc or
archives have an answer.

  Cheers,

  Etienne