class ActiveAdmin::Views::Pages::Layout

def main_content

Render the content_for(:layout) into the main content area 
def main_content
  content_for_layout = content_for(:layout)
  if content_for_layout.is_a?(Arbre::Element)
    current_arbre_element.add_child content_for_layout.children
  else
    text_node content_for_layout
  end
end