The TCM_GETTOOLTIPS message retrieves the handle to the tooltip control associated with a tab control. You can send this message explicitly or by using the TabCtrl_GetToolTips macro.
TCM_GETTOOLTIPS wParam = 0; // not used; must be zero lParam = 0; // not used; must be zero
Returns the handle to the tooltip control if successful or NULL otherwise.
A tab control creates a tooltip control if it has the TCS_TOOLTIPS style. You can also assign a tooltip control to a tab control by using the TCM_SETTOOLTIPS message.