The GnomeDruid is the Wizard-like widget that has a sequence of windows with Next and Back buttons and a Finish button on the final window of the sequence. The GnomeDruid widget has a stylised start page (GnomeDruidPageStart widget) and a stylised finish page (GnomeDruidPageFinish widget) and in between is a collection of pages where information from the user can be obtained (GnomeDruidPageStandard widgets).
On the start and finish pages you can only supply a title and some text. These pages are information pages and are not used to obtain responses from the user. The pages in between include a GtkVBox in which you can add your own widgets.