Please show your code.  Otherwise, we have little to go on.

Sent from my iPhone

> On Apr 13, 2021, at 2:41 AM, Allan Odgaard via Cocoa-dev 
> <cocoa-dev@lists.apple.com> wrote:
> 
> Probably two things relevant here.
> 
> One is General in system preferences which look like this:
> 
> ![](cid:2C16BC1B-F302-426F-9F6A-665F55C99045@simplit.com "PastedImage.png")
> 
> A Magic Mouse may count as a “track pad” so if you have this setting to 
> automatic, the scrollers will only be shown when scrolling.
> 
> You can manually override the scroller setting: 
> https://developer.apple.com/documentation/appkit/nsscroller/1523591-scrollerstyle
> 
> The style it sounds like you prefer is NSScrollerStyleOverlay.
> 
> However, I would discourage you from changing this.
> 
> 
>> On 13 Apr 2021, at 9:24, IOS NACSPORT via Cocoa-dev wrote:
>> 
>> Hi,
>> 
>> I connect any non-Apple mouse, turn off the Apple mouse and the scroll 
>> shows, in it I can´t change the background color. I used swift and macOS. 
>> Without another mouse, only magic mouse I can change this color without 
>> problem.
>> 
>> Regards
>> 
>>> El 12/4/21 a las 23:40, Jack Brindle escribió:
>>> What is the mouse, and is there any installed software involved that goes 
>>> with the mouse?
>>> 
>>> Jack
>>> 
>>> 
>>>> On Apr 12, 2021, at 12:30 AM, IOS NACSPORT via Cocoa-dev 
>>>> <cocoa-dev@lists.apple.com> wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> I don't kown is the correct place, In a NSScroller, when I conect the 
>>>> external mouse, not apple's mouse, the scroll change and show always, the 
>>>> problem is that I can't change its background color. How could it? or at 
>>>> least make it clear.
>>>> 
>>>> 
>>>> Regards
>>>> 
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