Changing a windows content

[srynoname]

hello, i'm wondering which way is typically taken, to change the complete content (or better whats displayed) of a window, hbox, vbox...

lets say i have a simple mail program, when i start it, it shows my inbox etc. (lets call this "startpage")
when i click "write mail" this all shall be removed and a window for writing mails shall appear, therefore totally different content.

how do i do that in theory?
do i make one window called "start" for the startpage and one called "write" for writing mails, and when i click "write mail" the window "start" is hidden and "write" is shown? well, but how do i get them to the same place, or is this automatically done? are there better ways for this/normally other ways used?

thanks in advance!

[cweiske]

You either have 2 windows, e.g. a write-mail window which pops up when you click the write mail button.
Or you use a GtkNotebook and hide the tabs. This way you can independently design your pages and make another one active

[srynoname]

thanks for your reply, i finally used a vbox (or hbox) with 1 "field" where i put the whole content. when needed, i remove this box from the window container and add a new one, also makes no problems with a changing window position etc