content: 
  ' The MIT License (MIT)
  
  ' Copyright (c) 2015 Karim Kawambwa
  
  ' Permission is hereby granted, free of charge, to any person obtaining a copy
  ' of this software and associated documentation files (the "Software"), to deal
  ' in the Software without restriction, including without limitation the rights
  ' to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  ' copies of the Software, and to permit persons to whom the Software is
  ' furnished to do so, subject to the following conditions:
  
  ' The above copyright notice and this permission notice shall be included in
  ' all copies or substantial portions of the Software.
  
  ' THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  ' IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  ' FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  ' AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  ' LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  ' OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  ' THE SOFTWARE.
  
  function IncludeSpriteContainerTo(this)
      this.sprites = {
          x___ : {
              sprites : []
          }
      }
      
      this.sprites.sprite = function(index)
          if index < 0 or index >= m.Count() then return invalid
          return m.x___.sprites[index]
      end function
      
      this.sprites.Count = function()
          return m.x___.sprites.Count()
      end function
      
      this.sprites.Add = function(sprite)
          if sprite <> invalid then m.x___.sprites.Push(sprite)
      end function
      
      this.sprites.SetZ = function(z)
          for each sprite in m.x___.sprites
              sprite.SetZ(z)
          end for
      end function
      
      this.sprites.AddZ = function(z)
          for each sprite in m.x___.sprites
              sprite.SetZ(sprite.GetZ()+z)
          end for
      end function
      
      this.sprites.MoveOffset = function(x, y)
          for each sprite in m.x___.sprites
              sprite.MoveOffset(x, y)
          end for
      end function
      
      this.sprites.SetDrawableFlag = function(drawable)
          for each sprite in m.x___.sprites
              sprite.SetDrawableFlag(drawable)
          end for
      end function
      
  end function