drawRect see empty array

Button in drawtestViewController.m is linked to pushPoint action in ChalkBoard.m. It populates pointArray with CGpoint objects. This array is full of objects everywhere, except when viewed from drawRect. It seems as from drawRect I'm somehow referencing the empty copy of original array, but I can not find any error ...

I have uploaded the whole project at http://dl.dropbox.com/u/42099382/drawtest.zip

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Button action in drawtestViewController.m

- (IBAction)myDo {
    NSLog(@"-Button was pressed");    
   [self.board pushPoint:CGPointMake(100, 100 )];
   [self.board pushPoint:CGPointMake(10, 100 )];
   [self.graphicView setNeedsDisplay];
 }
 

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//  ChalkBoard.h
 #import <UIKit/UIKit.h>
 
 @interface ChalkBoard : UIView
 -(void)pushPoint:(CGPoint)point;
 @property (nonatomic,retain) NSMutableArray *pointArray;
 @end
 

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//ChalkBoard.m
 #import "ChalkBoard.h"
 
 @implementation ChalkBoard
 @synthesize pointArray;
 
 - (id)initWithFrame:(CGRect)frame
 {
 self = [super initWithFrame:frame];
     if (self) {
         self.backgroundColor = [UIColor blackColor];
     }
     return self;
 }
 
 -(NSMutableArray *)pointArray 
 {
     if(pointArray == nil) pointArray = [[NSMutableArray alloc]initWithCapacity:10];
     return pointArray;
 }
 
 -(void)pushPoint:(CGPoint)point{
     // this is called from drawtestViewController.m by button press
     // in here the array is full and growing by each button press
     [self.pointArray addObject:[NSValue valueWithCGPoint:point]];
    NSLog(@"-pushPoint executed, size is %u, array: %@",[self.pointArray count], pointArray);
 }
 
 - (void)drawRect:(CGRect)rect{
 // here array is always empty
 NSLog(@"-DrawRect executed, size is %u, array: %@",[pointArray count], pointArray);
     if ([pointArray count] >1){   
        ... some irrelevant code
     }
 }
 
 @end
 

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NSLog output
 
 2012-04-09 11:34:39.145 drawtest[5260:f803] -DrawRect executed, size is 0, array: (null)
 2012-04-09 11:34:41.261 drawtest[5260:f803] -Button was pressed
 2012-04-09 11:34:41.262 drawtest[5260:f803] -pushPoint executed, size is 1, array: (
     "NSPoint: {100, 100}"
 )
 2012-04-09 11:34:41.264 drawtest[5260:f803] -pushPoint executed, size is 2, array: (
     "NSPoint: {100, 100}",
     "NSPoint: {10, 100}"
 )
 2012-04-09 11:34:41.266 drawtest[5260:f803] -DrawRect executed, size is 0, array: (null)
 2012-04-09 11:34:42.825 drawtest[5260:f803] -Button was pressed
 2012-04-09 11:34:42.826 drawtest[5260:f803] -pushPoint executed, size is 3, array: (
     "NSPoint: {100, 100}",
     "NSPoint: {10, 100}",
     "NSPoint: {100, 100}"
 )
 2012-04-09 11:34:42.827 drawtest[5260:f803] -pushPoint executed, size is 4, array: (
     "NSPoint: {100, 100}",
     "NSPoint: {10, 100}",
     "NSPoint: {100, 100}",
     "NSPoint: {10, 100}"
 )
 2012-04-09 11:34:42.829 drawtest[5260:f803] -DrawRect executed, size is 0, array: (null)
 

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