Warning from custom component

[Tom Fitzpatrick]

I'm trying to make use of the dynamic FormItem example of a custom 
component from the Webster/McLeod book. The code does work, but I'm getting 
a warning.

The warning is:
"The function, visible, hides a function in ancestor class, 'mx.core.UIObject'
The code is:
class DynamicFormItem extends mx.containers.FormItem
{
public function set visible(visible:Boolean)
{
super.visible = visible;
if (!visible)
{
height=0;
}
else
{
height=undefined;
}
}
}
Is there something wrong with the way I've written the code, or should I 
ignore the warning?

- Tom