I'm guessing you want something simple and non-invasive. Not sure there 
is such a thing.

You could just nuke all halos:

'From Squeak5.1 of 23 August 2016 [latest update: #16548] on 4 April 
2017 at 12:15:16 pm'!

!Preferences class methodsFor: 'standard queries' stamp: 'raa 4/4/2017 
12:10'!
cmdGesturesEnabled
     "compiled programatically -- return hard-coded preference value"
     ^ false! !

and then you get the blue without the halo. Or you could use a different 
Morph subclass and reimplement #blueButtonDown: to suit your needs, but 
using the blue button to get halos is presumed to be important and not 
easily overridden.

On 4/4/17 12:03 PM, H. Hirzel wrote:
> I definitively prefer the blue only solution. No halos.
>
> On 4/4/17, H. Hirzel <hannes.hirzel at gmail.com> wrote:
>> On 4/4/17, Bob Arning <arning315 at comcast.net> wrote:
>>> Did you want to change it to blue AND the halo appears? Or just go to
>>> blue and no halo?
>> Whatever is easier. If it does not matter than change to blue only.
>>
>> --Hannes
>>
>>> On 4/3/17 2:19 PM, H. Hirzel wrote:
>>>> Hello,
>>>>
>>>> http://wiki.squeak.org/squeak/2332  'Mouse button tester'
>>>>
>>>> has
>>>>
>>>>       m := Morph new.
>>>>       m on: #mouseDown send: #value: to:[:evt|
>>>> 	evt redButtonPressed ifTrue:[m color: Color red].
>>>> 	evt yellowButtonPressed ifTrue:[m color: Color yellow].
>>>> 	evt blueButtonPressed ifTrue:[m color: Color blue]
>>>>          ].
>>>>       m openInWorld.
>>>>
>>>> red and yellow button work, but the blue button brings up the halo as
>>>> it is noted on the wiki page (tested with a three button mouse).
>>>>
>>>> I wonder if there is a way to make the change of the button to blue
>>>> possible?
>>>>
>>>> --Hannes
>>>>
>>>

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