Barracuda: setVisible

Hi,
 
I've noticed some strange behaviour... or at least... what I assume to be
strange with the BComponent setVisible method.
 
Here's a extract from my html.
 
<table class="Dir::Get_Data.BrowsePage.p_mastertable">
 <tr>
  <td class="Dir::Iterate_Start.MasterBrowseHeading
Dir::Iterate_Next.MasterBrowseHeading Dir::Discard">[DISCARD]</td>
    ......
    #Other Directives follow here.
 </tr>
</table>
 
Pretty Simple.
 
I'd like to hide or display a table. Notice the 'p_mastertable' key on the
table node.
My understanding is that 'setVisible(false)' will hide the table. 
And I think it does in fact do this.
To the extent that the table isn't rendered.
 
The 'problem' I have however.. is that the 'child nodes'... in this case
from the model 'MasterBrowseHeading' is still being processed.
Is this normal?
 
I solved this by 'returning null' in my BTemplate instead of a BComponent
with 'setVisible(false)'.
 
Hmmmm....?
Regards
KD