Automatic Mouse scroll is not working in c# winforms

Hi,

I have a C# Winforms Application. I have Form which contains TabControl having 2 tabpages. If i come from one tab page to other tab page Automatic MOUSE SCROLL (vertical scroll bar) is not working even i clicked on tabpage content.

Observed on Window 7 and Windows 8 Desktops.

Working on Windows 10 Desktops and Laptops.

Design overview => Form->Tab Control->Tab Page1 -> Panel->Child Controls like labels, Text boxes, Buttons,Check boxes