iPad problem with transparent table view

[mako34]

hi guys, I have searched a lot!, and check some answers in SO and other sites to accomplish a clear table back groud, but dont know what Im I doing wrong??

here what Im doing in IB / table view

* style grouped
* drawing opaque (not checked)
* background (clear color)

in my .m file

// Customize the appearance of table view cells.
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

xtbl.backgroundColor = [UIColor clearColor];

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {

    //cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle 
                                   reuseIdentifier:CellIdentifier] autorelease];

}

// Configure the cell...


Employee *info = [[eidarray objectAtIndex:indexPath.row] objectAtIndex:0];
NSLog(@"employeeArrayemployeeArray = %@",info.namemployee);

cell.textLabel.font = [UIFont systemFontOfSize:30.0];
cell.textLabel.textAlignment = UITextAlignmentCenter;

cell.textLabel.text = info.namemployee;


return cell;
 }

I have tried putting the

xtbl.backgroundColor = [UIColor clearColor];

in view did load but doesnt work either,

how can I accomplish the clear background??
here how it looks now, I just want the background of the table transparent and the cells as they are,

thanks a lot!