Solution: WPF usercontrol does not accept userinput when host in a EdmTaskPAge

[AmenJlili]

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Issue:

• Create a WPF usercontrol with any input and host in an EdmTaskPage.
• Compile add-in and add to the vault.
• Create task and choose add-in from dropdown.
• See created tab to replicate issue.

[AmenJlili]

Code below seems to fix the issue:

public partial class ConditionsWpf : UserControl
    {
        #region Public Constructors

        private const UInt32 DLGC_WANTARROWS = 0x0001;
        private const UInt32 DLGC_WANTTAB = 0x0002;
        private const UInt32 DLGC_WANTALLKEYS = 0x0004;
        private const UInt32 DLGC_HASSETSEL = 0x0008;
        private const UInt32 DLGC_WANTCHARS = 0x0080;
        private const UInt32 WM_GETDLGCODE = 0x0087;

        public ConditionsWpf()
        {
            InitializeComponent();
            Loaded += delegate
            {
                HwndSource s = HwndSource.FromVisual(this) as HwndSource;
                if (s != null)
                    s.AddHook(new HwndSourceHook(ChildHwndSourceHook));
            };
        }


        IntPtr ChildHwndSourceHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == WM_GETDLGCODE)
            {
                handled = true;
                return new IntPtr(DLGC_WANTCHARS | DLGC_WANTARROWS | DLGC_HASSETSEL);
            }
            return IntPtr.Zero;
        }

        #endregion
    }