TTabControl = class(TCustomTabControl)
class PASCALIMPLEMENTATION TTabControl : public TCustomTabControl
TTabControl is a tab set that has the appearance of notebook dividers.
Use TTabControl to add a control with multiple tab settings to a form. Unlike a page control, TTabControl is not made up of several pages that contain different controls. Instead, TTabControl is a single object. When the current tab changes, the tab control must directly update its contents to reflect the change in an OnChange event handler.