quirky default button coloring

FROM : Daniel Child
DATE : Thu Feb 21 20:55:27 2008

From what I read, the default (button in a view is outlined/shaded 
in blue and is set as the button which responds to RETURN. I have a 
serious of buttons (step 1, step 2, etc.), and I want the appropriate 
button to be highlighted as the default when it is turn to do that 
step. I used this code within a "showWindow" method which loads the 
window.

int stepsCompleted = [[dataValues objectForKey: @"steps completed"] 
intValue];

  switch (stepsCompleted)
  {
  case 0:
    [step1Button setKeyEquivalent:@"\r"];
      break;

  case 1:
    [step2Button setKeyEquivalent:@"\r"]; // works
    [step1Button setKeyEquivalent:@""]; // but blue edge does not 
move to button 2
  break;
....

From When I do this, the correct button does indeed respond to 
RETURN. But the blue highlight remains on the first button. I also 
tried [<button> setHighlight: <YES/NO>] to control the highlighting 
state, but with square buttons that simply makes them a dark grey and 
does not affect the blue outline.

          In the nib, all of the buttons are marked as having no key 
equivalent. I should note that I am using the square button shape. Is 
this a bug?