nsviewcontroller// nsbutton background color , why nsbutton setbackgroundcolor does not display the color ? when display the nsviewcontroller

Hello,

Sorry for my langage , i am french.

I have a view in a nsobject.

I have a view with a button in a nsviewcontroller , for the button : i don't see the color when the view is displayed.

I do in the nsobject :

[MclViewControl addSubview : [MclViewController view] ];

[[MclViewController view] setFrame : [MclViewControl bounds]];

But I do in the nsviewcontroller : - (void)viewDidLoad

Boolean W_BooleanColor = [SaiMclTitTxt drawsBackground];

if (W_BooleanColor == false)

{

[SaiMclTitTxt setDrawsBackground : true];

}

[SaiMclTitTxt setBackgroundColor : [NSColor blackColor]];

[[SaiMclValider cell] setBackgroundColor : NSColor.cyanColor];

For the label the background color is displayed (Ok).

Why not for the nsbutton ?

Thank you.