code: public function renderTreeNode(Varien_Data_Tree_Node $node, $indentLevel=0)
      {
          $block = $this->getLayout()->createBlock('sheep_debug/view');
          $block->setRequestInfo($this->getRequestInfo());
          $block->setTemplate('sheep_debug/view/panel/_block_node.phtml');
          $block->setNode($node);
          $block->setIndent($indentLevel);
  
          return $block->toHtml();
      }
docs: Renders a rendering tree node
  
  @see Sheep_Debug_Block_View::getBlocksTree
  @param Varien_Data_Tree_Node $node
  @param int                   $indentLevel
  @return string