[horde] sidebar problem with themes

[se]

Hi;

when i try to change  the theme ,it shows two sidebars on left. i added the line
  'target' => '_parent',     to horde/config/registry.php but at that time;
when i click "Horde" from sidebar, sidebar disappears. How can i correct this??

(using horde 3.2.2 )

Thanks,

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