[solved][SlimDX]Multiple Swapchains - Problem with Resizing?

using System;using System.Windows;using SlimDX.Direct3D9;using System.Windows.Interop;using SlimDX;using System.Windows.Media;using System.Runtime.InteropServices;namespace minimalistic{    class CustomVertex    {        [StructLayout(LayoutKind.Sequential)]        public struct TransformedColored        {            public Vector4 Position;            public int Color;            public static readonly VertexFormat Format = VertexFormat.Diffuse | VertexFormat.PositionRhw;        }        [StructLayout(LayoutKind.Sequential)]        public struct PositionColored        {            public PositionColored(float x, float y, float z, int color)            {                Position = new Vector3(x, y, z);                Color = color;            }            public Vector3 Position;            public int Color;            public static readonly VertexFormat Format = VertexFormat.Diffuse | VertexFormat.Position;        }    }        public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();            InitializeD3D();            this.Loaded += new RoutedEventHandler(Window_Loaded);        }        Device device;        Direct3D Direct3D;        SwapChain swapchain;        CustomVertex.PositionColored[] vertices;        PresentParameters pp;        public void InitializeD3D()        {            HwndSource hwnd = new HwndSource(0, 0, 0, 0, 0, "test", IntPtr.Zero);            Direct3D = new SlimDX.Direct3D9.Direct3D();            pp = new PresentParameters();            pp.SwapEffect = SwapEffect.Discard;            pp.DeviceWindowHandle = hwnd.Handle;            pp.Windowed = true;            pp.BackBufferWidth = 400;            pp.BackBufferHeight = 400;            pp.BackBufferFormat = Format.X8R8G8B8;            device = new Device(                Direct3D,                0,                DeviceType.Hardware,                hwnd.Handle,                CreateFlags.HardwareVertexProcessing,                pp                );            swapchain = new SwapChain(device, pp);        }        private void Window_Loaded(object sender, RoutedEventArgs e)        {            CompositionTarget.Rendering += new EventHandler(OnRendering);            d3dimage.Lock();            d3dimage.SetBackBuffer(              D3DResourceType.IDirect3DSurface9,              swapchain.GetBackBuffer(0).ComPointer              );            d3dimage.Unlock();            vertices = new CustomVertex.PositionColored[3];            vertices[0].Position = new Vector3(-1f, -1f, 0f);            vertices[0].Color = System.Drawing.Color.Red.ToArgb();            vertices[1].Position = new Vector3(1f, -1f, 0f);            vertices[1].Color = System.Drawing.Color.Green.ToArgb();            vertices[2].Position = new Vector3(0f, 1, 0f);            vertices[2].Color = System.Drawing.Color.Yellow.ToArgb();            device.SetRenderState(RenderState.Lighting, false);            device.SetRenderState(RenderState.CullMode, Cull.None);            device.VertexFormat = CustomVertex.PositionColored.Format;            device.SetTransform(TransformState.Projection, SlimDX.Matrix.PerspectiveFovLH((float)Math.PI / 4, (float)output.ActualWidth / (float)output.ActualHeight, 1f, 50f));            device.SetTransform(TransformState.View, SlimDX.Matrix.LookAtLH(new Vector3(0, 0, 10), new Vector3(0, 0, 0), new Vector3(0, 1, 0)));        }        protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)        {                                          pp.BackBufferWidth = (int)output.ActualWidth;                pp.BackBufferHeight = (int)output.ActualHeight;                                      if (swapchain != null)                {                 swapchain.Dispose();                                swapchain = new SwapChain(device, pp);                                    }                d3dimage.Lock();                d3dimage.SetBackBuffer(D3DResourceType.IDirect3DSurface9, swapchain.GetBackBuffer(0).ComPointer);                d3dimage.Unlock();                                device.SetTransform(TransformState.Projection, SlimDX.Matrix.PerspectiveFovLH((float)Math.PI / 4, (float)output.ActualWidth / (float)output.ActualHeight, 1f, 50f));                device.SetTransform(TransformState.View, SlimDX.Matrix.LookAtLH(new Vector3(0, 0, 10), new Vector3(0, 0, 0), new Vector3(0, 1, 0)));                device.Viewport = new Viewport(0, 0, (int)output.Width, (int)output.Height);                                device.SetRenderTarget(0, swapchain.GetBackBuffer(0));                    }        public void Render()        {                device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, System.Drawing.Color.Pink, 1.0f, 0);                device.BeginScene();                device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, vertices);                device.EndScene();        }        private void OnRendering(object sender, EventArgs e)        {            d3dimage.Lock();            Render();            d3dimage.AddDirtyRect(new Int32Rect(0, 0, (int)d3dimage.Width, (int)d3dimage.Height));            d3dimage.Unlock();        }    }}