property Slider.EnableParts as Long
Specifies the parts of the control to be enabled or disabled.

TypeDescription
Long A long expression that specifies an OR combination of PartEnum values that indicates which parts are visible and which parts are not shown. 

By default, the EnableParts property is 897 ( that's a OR combination of exLowerBackPart, exThumbPart, exUpperBackPart). The VisiblePart property specifies which part is visible and which part is hidden. By default, when a part becomes visible, automatically the EnablePart is called. Use the EnablePart property to disable parts of the control. A disabled part can't be clicked, and shows the disabled state. Use the Background property to apply a visual effect on any part of the control. The EnableParts property is similar with the EnablePart property.

By default, the following parts are enabled: