macOS Customize Drop Box (NSBox)?

[Darkroom]

Why isn't my NSBox setting it's fill color to green like i'm stating in my code? i've tried setting it's border width, border color, nothing seems to affect it... what am i doing wrong?

-(void)awakeFromNib
	{
	DropBox *box = [[DropBox alloc] initWithFrame:NSMakeRect(140, 100, 125, 100)];
	[box setAutoresizingMask:NSViewMinYMargin];
	[box setTitle:@"Drop Stuff Here"];  [COLOR="Green"]//this works, it's sets the box's title[/COLOR]
	[box setFillColor:[NSColor greenColor]];  [COLOR="Green"]//this doesn't work[/COLOR]
	[[self contentView] addSubview:box];
	}

 

[kainjow]

Functional only when the receiver’s box type (boxType) is NSBoxCustom and its border type (borderType) is NSLineBorder.