KBTabber (subclass of KBFramer)

Initial page (initpage)

If set, this value identifies (by name) the tab page to be shown when the form is opened. If not set, then the first page is displayed.

Use wide tabs (widetabs)

If set, the tabs are split evenly across the full width of the tab bar. Note that this effect does not take into account the width needed for the text in each tab, so text my be truncated.

Force height (forceheight)

This can be set to forcibly set the tab bar height in pixels. The normal, and default, is to set the height according to the windowing system and theme/style.