Thank you very much for your reply.
Indeed, calling invalidateShadow did the trick. Now I need to find a way to be 
notified when [[view animator] dosomething] completes, otherwise the shadow 
takes the shape of the window before the transformation.

Cheers,
Jean


On 22 oct. 2012, at 22:06, Ken Thomases <k...@codeweavers.com> wrote:

> On Oct 22, 2012, at 2:07 PM, Jean Suisse wrote:
> 
>> The issue:
>> If the NSPanel opens with theView visible, when hiding it, theView's shadow 
>> remains.
>> If the NSPanel opens with theView hidden, when displaying theView, theView 
>> doesn't get a shadow.
>> 
>> It seems that  the shadow for the panel is only computed when first 
>> displayed. I tried various options, but I must be missing something.
> 
> You're looking for -[NSWindow invalidateShadow].
> 
> Cheers,
> Ken
> 


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