Mouse Wheel Scrolling not always working in Windows 10

On Windows 7, when using the UltraCombo control, if I click the drop down and see a long list of rows, I can hover the mouse over those rows and use the mouse scroll wheel to go up and down. However, in Windows 10, this doesn’t work. Interestingly, if I hover over the control itself, the mouse scroll wheel DOES work. I assume this is a bug, and the mouse scroll wheel should also work while hovering over the rows?

BTW, in Windows 10, if you turn off the "Scroll inactive windows when I hover over them" feature, it works fine. However, we don't want to have to tell all our users to turn off a Windows option, just so they can easily scroll their drop down lists that some of them want to keep on. Especially as it appears that setting should not interfere with how this control has always worked in the past.

Hi Sui,

This is actually expected behavior for Windows 10. However, we are looking into the possibility of forcing individual controls to use the old behavior. I'll write this up for our developers to investigate.

Hi Sui,

Which version are you using? I tried this in the latest 15.2 service release and I can scroll normally while hovering over the control or over the rows.

We're using 15.1.20151.2132, which we thought was the latest. (We're taking this over from the programmer who usually maintained it.) You're saying the newer version always works, regardless of the Windows 10 setting I mentioned in my 2nd post?

It depends what you mean by "always works."

Windows 10 has changed the default behavior of the mouse wheel. In previous versions of Windows, the mouse wheel affected the active window, regardless of the position of the mouse on the screen.

In Windows 10, this was changed. The mouse wheel now affects whatever window is under the mouse pointer, regardless of the active window.

Our controls were not responding to the second case (where the mouse wheel is over the control), since this was newly-introduced in Windows 10.

So "works" here means that the control now behave correctly in response to the way the operating system tells them to. In Windows 10, that means that by default the controls will only scroll when the mouse pointer is over the control. If you don't want that behavior, then you can change it at the operating system level using by turning off the "Scroll inactive windows when I hover over them" option.

Thanks for the thorough explanation.

[quote user="Mike Saltzman"]In Windows 10, that means that by default the controls will only scroll when the mouse pointer is over the control.[/quote]

That makes sense. However, the drop-down grid is part of the UltraCombo control. Therefore, hovering over it should still make it to scroll, as opposed to having to only hover over the textbox-like portion.

If "Scroll inactive windows when I hover over them" is turned on (which it is by default in Windows 10) then when you mouse over either the edit portion or the dropdown of UltraCombo, the mouse wheel should scroll through the list.

If that's not working, then it's a bug.

Hi Everyone,

I'm using 15.2.20152.1000, but if "Scroll inactive windows when I hover over them" is turned off the scroll seems to work fine for both cases; when it's turned on, the scroll over the dropdown is not working, it's just working for the edit portion.

Finally, this behavior is wrong?

I'm pretty sure you just need to get the latest service release.

How to get the latest service release – Windows Forms – Service Releases