Having some trouble with alt-tabing. When I'm fullscreen and alt-tab, I leave my game, and it dissapears completely. Can't "cycle" to it anymore, and clicking on its icon on the taskbar does nothing. Do I need to process a specific windows message, or is there some device state i could poll?

Turning off DXGI with IDXGIFactory::MakeWindowAssociation makes no difference. BTW, I am using sharpDX.

p.s. The Sharpdx d3d10 samples also behave similarly, i.e. the game becomes inaccesible when alt tabbing in fullscreen.

Yeah, that behaviour applies in Directx9, where alt-tabing results in losing the device. In Directx10 - 11 the device no longer is lost, so I am thinking its got something to do with DXGI not playing nice with winforms.

Yeah, I did it the proper way. Here is the code I use (it's SharpDX/C#, but almost identical to Directx10/c++):

      Factory dxgiFactory = new Factory();
      Adapter dxgiAdapter = dxgiFactory.Adapters[0];
      graphicsDevice = new Device(dxgiAdapter, DeviceCreationFlags.Debug);

      displayMode = new ModeDescription(0, 0, new Rational(60, 1), Format.R8G8B8A8_UNorm);
      var swapDesc = new SwapChainDescription()
      {
        ModeDescription = displayMode,
        SampleDescription = new SampleDescription(1, 0),
        Usage = Usage.RenderTargetOutput,
        BufferCount = 1,
        OutputHandle = myForm.Handle,
        IsWindowed = true,
        SwapEffect = SwapEffect.Discard,
        Flags = SwapChainFlags.AllowModeSwitch
      };
      swapChain = new SwapChain(dxgiFactory, graphicsDevice, swapDesc);
   
      dxgiFactory.MakeWindowAssociation(myForm.Handle, WindowAssociationFlags.IgnoreAll);