How to fix the WPF form resize – controls lagging behind and black background?

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This is complete working code based on Wieser Software Ltd’s 2nd solution.

public partial class MainView : Window
{
    public MainView()
    {
        InitializeComponent();

        //ensure win32 handle is created
        var handle = new WindowInteropHelper(this).EnsureHandle();

        //set window background
        var result = SetClassLong(handle, GCL_HBRBACKGROUND, GetSysColorBrush(COLOR_WINDOW));
    }

    public static IntPtr SetClassLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
    {
        //check for x64
        if (IntPtr.Size > 4)
            return SetClassLongPtr64(hWnd, nIndex, dwNewLong);
        else
            return new IntPtr(SetClassLongPtr32(hWnd, nIndex, unchecked((uint)dwNewLong.ToInt32())));
    }

    private const int GCL_HBRBACKGROUND = -10;
    private const int COLOR_WINDOW = 5;

    [DllImport("user32.dll", EntryPoint = "SetClassLong")]
    public static extern uint SetClassLongPtr32(IntPtr hWnd, int nIndex, uint dwNewLong);

    [DllImport("user32.dll", EntryPoint = "SetClassLongPtr")]
    public static extern IntPtr SetClassLongPtr64(IntPtr hWnd, int nIndex, IntPtr dwNewLong);

    [DllImport("user32.dll")]
    static extern IntPtr GetSysColorBrush(int nIndex);
}

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