Hello. I'm learning F#, and decided to try making simple XNA games for windows using F# (pure enthusiasm) , and got a window with some images showing up.
Here's the code:
(*Methods*)     
member self.DrawSprites() = 
    _spriteBatch.Begin()
    for i = 0 to _list.Length-1 do
        let spentity = _list.List.ElementAt(i)
        _spriteBatch.Draw(spentity.ImageTexture,new Rectangle(100,100,(int)spentity.Width,(int)spentity.Height),Color.White)      
    _spriteBatch.End()
(*Overriding*)   
override self.Initialize() =
    ChangeGraphicsProfile()                              
    _graphicsDevice <- _graphics.GraphicsDevice
    _list.AddSprite(0,"NagatoYuki",992.0,990.0)
    base.Initialize() 
override self.LoadContent() =         
    _spriteBatch <- new SpriteBatch(_graphicsDevice)
    base.LoadContent()
override self.Draw(gameTime : GameTime) =
    base.Draw(gameTime)
    _graphics.GraphicsDevice.Clear(Color.CornflowerBlue)
    self.DrawSprites()
And the AddSprite Method:
   member self.AddSprite(ID : int,imageTexture : string , width : float, height : float) = 
      let texture = content.Load<Texture2D>(imageTexture)
      list <- list @ [new SpriteEntity(ID,list.Length, texture,Vector2.Zero,width,height)]
The _list object has a ContentManager, here's the constructor:
   type SpriteList(_content : ContentManager byref) =
      let mutable content = _content
      let mutable list = []
But I can't minimize the window, since when it regains its focus, i get this error:
ObjectDisposedException
  Cannot access a disposed object.
  Object name: 'GraphicsDevice'.
What is happening?