[Application]creer des menus du genre Word, Excell,Sibelius etc.

using System.Runtime.InteropServices;   

namespace transparentform   
{   
    public partial class Form1 : Form   
    {   
        [StructLayout(LayoutKind.Sequential)]   
        public struct MARGINS   
        {   
            public int cxLeftWidth;   
            public int cxRightWidth;   
            public int cyTopHeight;   
            public int cyBottomHeight;   
        }    
        [DllImport("dwmapi.dll")]   
        public static extern int DwmExtendFrameIntoClientArea(   
           IntPtr hWnd,   
           ref MARGINS pMarInset   
        );    


        public Form1()   
        {   
            this.BackColor = Color.Black;   
            MARGINS margins = new MARGINS();   
            margins.cxLeftWidth = -1;   
            margins.cxRightWidth = -1;   
            margins.cyTopHeight = -1;   
            margins.cyBottomHeight = -1;   

            IntPtr hWnd = this.Handle;   
            int result = DwmExtendFrameIntoClientArea(hWnd, ref margins);    

            InitializeComponent();   
        }   

    }   
}