performSelector ARC warning

Possible Duplicate:
performSelector may cause a leak because its selector is unknown

I have this code in non-ARC that works without errors or warnings:

- (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents
{
    // Only care about value changed controlEvent
    _target = target;
    _action = action;
}

- (void)setValue:(float)value
{
    if (value > _maximumValue)
    {
        value = _maximumValue;
    } else if (value < _minimumValue){
        value = _minimumValue;
    }

    // Check range
    if (value <= _maximumValue & value >= _minimumValue)
    {
        _value = value;
        // Rotate knob to proper angle
        rotation = [self calculateAngleForValue:_value];
        // Rotate image
        thumbImageView.transform = CGAffineTransformMakeRotation(rotation);
    }
    if (continuous)
    {
        [_target performSelector:_action withObject:self]; //warning here
    }
}

However, after I convert to project to ARC, I get this warning:

"Perform Selector may cause a leak because its selector is unknown."

I would appreciate ideas on how to revise my code accordingly..