System Hanging when calling SendMessage API

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C#2.0

C#

Hi,

I've created a Custom Balloon tool tip using the following API's in C#.

#region Static Extern Methods (API)

        [DllImport("User32", SetLastError = true)]
        internal static extern int GetClientRect(
            int hWnd,
            ref RECT lpRect);

        [DllImport("User32", SetLastError = true)]
        internal static extern int ClientToScreen(
            int hWnd,
            ref POINTAPI lpPoint);

        [DllImport("User32", SetLastError = true)]
        private static extern int ClientToScreen(
            int hWnd,
            ref RECT lpRect);

        [DllImport("User32", SetLastError = true)]
        internal static extern int SendMessage(
            int hWnd,
            int Msg,
            int wParam,
            IntPtr lParam);

        [DllImport("user32.dll", SetLastError = true)]
        internal static extern int SendMessage(
            int hWnd,
            int Msg,
            int wParam,
            int lParam);

        [DllImport("user32.dll", SetLastError = true)]
        internal static extern int SendMessage(
            int hWnd,
            int Msg,
            int wParam,
            TOOLINFO lParam);

        [DllImport("User32", SetLastError = true)]
        internal static extern int CreateWindowEx(
            int dwExStyle,
            string lpClassName,
            string lpWindowName,
            int dwStyle,
            int X,
            int Y,
            int nWidth,
            int nHeight,
            int hWndParent,
            int hMenu,
            int hInstance,
            IntPtr lpParam);

        [DllImport("User32", SetLastError = true)]
        internal static extern int DestroyWindow(int hwnd);

        [DllImport("User32", SetLastError = true)]
        static extern int MoveWindow(
            int hwnd,
            int x,
            int y,
            int nWidth,
            int nHeight,
            int bRepaint);

        #endregion

My Problem is when the form is in minimized state and shown the balloon means. The entire system is hanged.

I found the that problem when calling the "SendMessage(int hWnd,int Msg,int wParam,IntPtr lParam)" Method.

please some one suggesst suggest me to solve this problem.

Thanks & Regards
Dhilip.R