need help about display image on the cell,

Hi everyone
Iam working on UITableView and doing an customization for a cell of each row.However, my image can not be displayed at all
What I am having so far is

Code:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"reUsedDetailCell";
    
    DetailCell *cell    = (DetailCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; // this is my customized cell
    
    if ( cell == Nil ) {
        cell        =   [[DetailCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; // do initialization
    }
    return cell;
} 

At DetailCell.m:

Code:

//
//  DetailCell.m
#import "DetailCell.h"

@implementation DetailCell
@synthesize itemImg;  // itemImg is type of UIImageView
@synthesize itemName;
@synthesize itemDesp;
@synthesize itemSize;
@synthesize itemPrice;
@synthesize itemInfo;
@synthesize addItem;

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.backgroundColor = [UIColor redColor];
        itemImg = [[UIImageView alloc] init];
        [itemImg setImage:[UIImage imageNamed:@"gear_24.png"]] ;  
        //[self.contentView addSubview:itemImg]; // I comment this out because itemImg is already in DetailCell by using Storyboard
    }
    

    return self;
}


- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

@end

Can anybody point it out if I have made a mistake somewhere. I appreciate that

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Anyone comes up with an idea please help.....