HELP - Mouse not scrolling in vst instruments on 2nd display


I’m using Cubase 6.5 x64 in Windows 7 64bit. I have dual monitors connected to my PC with a graphics card. Main display with DVI-DVI, and second display is actually a LCD TV (40") connected with DVI-VGA. On my second monitor (TV) mouse scrolling works for everything, explorer, browser, etc. But in cubase, VST instruments such as Halion 5, Kontakt, Geist, etc, mouse doesn’t doesn’t scroll in them when these instrument GUI is placed in 2nd monitor. When I drag them back to 1st monitor, mouse scrolling works.

Can anyone please help if you are getting such issues and how to solve it?

Thanks in advance.