--Элемент
Element = {}

function Element:new(row, column, text)                        
	local newObj = {}               
	newObj.Row = row or 0
	newObj.Column = column or 0
	newObj.Text = text or ''

	function Element:tostring()
		return 'row='..self.Row..';column='..self.Column..';Text='..self.Text
	end
	
	self.__index = self                     
	return setmetatable(newObj, self)       
end


--Элемент кнопка
ButtonElement = {}
--наследуем
setmetatable(ButtonElement ,{__index = Element}) 

function ButtonElement:new(row, column, text, color)
	local newObj = Element:new(row, column, text)
	newObj.Color = color or ''

	function ButtonElement:tostring()
		return Element.tostring(self)..';Color='..self.Color
	end

	self.__index = self
	return setmetatable(newObj, self)
end