Hello Ramesh,
for the first step I recommend you the chapter Vertical Scrollbar. For example, the section Select the appearance for the Vertical Scrollbar explains the differences between the normal and mini version of the scrollbars.
Since your application case does not correspond to any of the per default provided Scrollbar Config objects, you will need to create your own object. The simplest in your case would be to:
1. Create a copy of the existing object WidgetSet::MiniVerticalScrollbar_Medium. How you do this is explained in the section Modify provided default Vertical Scrollbar Config objects.
2. Associate the copied configuration object to the scrollbar.
3. Modify the property AutoHideDelay of the copied configuration object to the value 0.
4. Modify the property FadeInDuration of the copied configuration object to the value 0.
5. Modify the property FadeOutDuration of the copied configuration object to the value 0.
6. Modify the property HideIfNotNeeded of the copied configuration object to the value false.
7. Modify the property Touchable of the copied configuration object to the value true.
More details concerning the above used properties is found the above mentioned chapter starting with the section Customize your own Vertical Scrollbar.
Best regards
Paul Banach