Onchange event miss for TTMSFMXTrackBar like default TTrackBar.
Of course you have two events OnValueChanged and OnValueChanging but this two event are not "Standard" TNotifyEvent. So it's difficult to handle standard event for all the component (event passed has parameters for example) !
Same problem with TTMSFMXRating component and all component.
You will say TSwitch has no OnChange event but TSwitch has an OnClick which is a Standard TNotifyEvent...