System.Windows.Forms.CommandBar.GetButtonInfo C# (CSharp) Method

        private NativeMethods.TBBUTTONINFO GetButtonInfo(int index)
        {
            CommandBarItem item = items[index];

            NativeMethods.TBBUTTONINFO buttonInfo = new NativeMethods.TBBUTTONINFO();
            buttonInfo.cbSize = Marshal.SizeOf(typeof(NativeMethods.TBBUTTONINFO));

            buttonInfo.dwMask = NativeMethods.TBIF_IMAGE | NativeMethods.TBIF_STATE | NativeMethods.TBIF_STYLE | NativeMethods.TBIF_COMMAND;
            buttonInfo.idCommand = index;
            buttonInfo.iImage = NativeMethods.I_IMAGECALLBACK;
            buttonInfo.fsStyle = NativeMethods.BTNS_BUTTON | NativeMethods.BTNS_AUTOSIZE;
            buttonInfo.fsState = 0;
            buttonInfo.cx = 0;
            buttonInfo.lParam = IntPtr.Zero;
            buttonInfo.pszText = IntPtr.Zero;
            buttonInfo.cchText = 0;

            if (!item.IsVisible)
            {
                buttonInfo.fsState |= NativeMethods.TBSTATE_HIDDEN;
            }

            CommandBarComboBox comboBox = item as CommandBarComboBox;
            if (comboBox != null)
            {
                buttonInfo.cx = (short) (comboBox.Width + 4);
                buttonInfo.dwMask = NativeMethods.TBIF_SIZE;
            }

            if (item is CommandBarSeparator)
            {
                buttonInfo.fsStyle |= NativeMethods.BTNS_SEP;
            }
            else
            {
                if (item.IsEnabled)
                {
                    buttonInfo.fsState |= NativeMethods.TBSTATE_ENABLED;
                }

                CommandBarMenu menu = item as CommandBarMenu;
                if ((menu != null) && (menu.Items.Count > 0))
                {
                    buttonInfo.fsStyle |= NativeMethods.BTNS_DROPDOWN;
                }

                if ((style == CommandBarStyle.ToolBar) || (this.Style == CommandBarStyle.TextToolBar))
                {
                    if (item is CommandBarMenu)
                    {
                        buttonInfo.fsStyle |= NativeMethods.BTNS_WHOLEDROPDOWN;
                    }
                }

                CommandBarCheckBox checkBox = item as CommandBarCheckBox;
                if ((checkBox != null) && (checkBox.IsChecked))
                {
                    buttonInfo.fsState |= NativeMethods.TBSTATE_CHECKED;
                }
            }

            if (item is CommandBarSeparator)
            {
                buttonInfo.iImage = NativeMethods.I_IMAGENONE;
            }
            else if (item.Image != null)
            {
                buttonInfo.iImage = index;
            }

            if (((this.Style == CommandBarStyle.Menu)||(this.Style == CommandBarStyle.TextToolBar)) && (item.Text != null) && (item.Text.Length != 0))
            {
                buttonInfo.dwMask |= NativeMethods.TBIF_TEXT;
                buttonInfo.pszText = Marshal.StringToHGlobalUni(item.Text + "\0");
                buttonInfo.cchText = item.Text.Length;
            }

            return buttonInfo;
        }