Show a particular tab in the web browser

Suppose that I have two tabs open in MATLAB's web browser.

   [~,A]=web('google.com','-new');
   [~,B]=web('bing.com','-new');

I can request focus on the active tab:

   B.requestFocus(); % this works
   B.grabFocus(); % this also works

but the request does not work for the inactive tab.

   A.requestFocus(); % doesn't do anything
   A.grabFocus(); % doesn't do anything

So how does one show a tab (other than the active one) in the web browser?