class ActiveAdmin::Views::Panel

def add_child(child) 

def add_child(child)
  if @contents
    @contents << child
  else
    super
  end
end

def build(title, attributes = {}) 

def build(title, attributes = {})
  super(attributes)
  add_class "panel"
  @title = h3(title.to_s)
  @contents = div(class: "panel_contents")
end

def children?

correcly appends string values, etc.
contents have been added to. This ensures that the panel
Override children? to only report children when the panel's 
def children?
  @contents.children?
end

def header_action(*args) 

def header_action(*args)
  action = args[0]
  @title << div(class: "header_action") do
    action
  end
end