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Choppy Core Animation

Fellow list members..

I have been round and round with my choppy resize animation. Basically I have a custom view in IB that contains 3 subviews. I am trying the iTunes "show/hide" artwork effect. Basically I have a NSTableView that is wrapped in a custom nsview that displays financial transactions and the view underneath displays a detailed view of the selected transaction. To trigger the resize, the user just double- clicks the transaction and I resize both custom nsviews. shrinking the deatil view down and expanding the transaction view so that the transaction nstableview takes up any remaining space. I am guessing that I am redrawing excessively which might be causing the "choppiness". I am open to any and all suggestions. I have pasted the relevant code below.

Thanks,
Hasani

Utilities.m -----------------------------------------------------------

/**
* Sets the frame for a view with animation.
*/
+(void)setFrameForViewWithAnimation:(NSView *)view frame:(NSRect)frame
{

if ( [ view wantsLayer ] )
{
[ [ view animator ] setFrame:frame ];
}
else
{
NSRect startFrame = [ view frame ];

// create the dictionary..
NSMutableDictionary *animationDictionary = [ [ NSMutableDictionary alloc ] init ];

// set the target
[ animationDictionary setObject:view forKey:NSViewAnimationTargetKey ];

// set the starting size..
[ animationDictionary setObject:[ NSValue valueWithRect:startFrame ] forKey:NSViewAnimationStartFrameKey ];

// set the end frame
[ animationDictionary setObject:[ NSValue valueWithRect:frame ] forKey:NSViewAnimationEndFrameKey ];

// construct the animation..
NSViewAnimation *animation = [ [ NSViewAnimation alloc ] initWithViewAnimations:[ NSArray arrayWithObject:animationDictionary ] ];

// set the duration of the animation..
[ animation setDuration:0.25 ];

[ animation startAnimation ];

[ animation release ];
}

}
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