/// Sent when a combo box cannot allocate enough memory to meet a specific request. The parent window of the combo box receives this notification
/// code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_ERRSPACE=(-1),
/// <summary>
/// Sent when the user changes the current selection in the list box of a combo box. The user can change the selection by clicking in the list box or
/// by using the arrow keys. The parent window of the combo box receives this notification code in the form of a WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_SELCHANGE=1,
/// <summary>
/// Sent when the user double-clicks a string in the list box of a combo box. The parent window of the combo box receives this notification code
/// through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_DBLCLK=2,
/// <summary>
/// Sent when a combo box receives the keyboard focus. The parent window of the combo box receives this notification code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_SETFOCUS=3,
/// <summary>
/// Sent when a combo box loses the keyboard focus. The parent window of the combo box receives this notification code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_KILLFOCUS=4,
/// <summary>
/// Sent after the user has taken an action that may have altered the text in the edit control portion of a combo box. Unlike the CBN_EDITUPDATE
/// notification code, this notification code is sent after the system updates the screen. The parent window of the combo box receives this
/// notification code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_EDITCHANGE=5,
/// <summary>
/// Sent when the edit control portion of a combo box is about to display altered text. This notification code is sent after the control has
/// formatted the text, but before it displays the text. The parent window of the combo box receives this notification code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_EDITUPDATE=6,
/// <summary>
/// Sent when the list box of a combo box is about to be made visible. The parent window of the combo box receives this notification code through the
/// WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_DROPDOWN=7,
/// <summary>
/// Sent when the list box of a combo box has been closed. The parent window of the combo box receives this notification code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_CLOSEUP=8,
/// <summary>
/// Sent when the user selects a list item, or selects an item and then closes the list. It indicates that the user's selection is to be processed.
/// The parent window of the combo box receives this notification code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_SELENDOK=9,
/// <summary>
/// Sent when the user selects an item, but then selects another control or closes the dialog box. It indicates the user's initial selection is to be
/// ignored. The parent window of the combo box receives this notification code through the WM_COMMAND message.
/// <list>
/// <item>
/// <term>wParam</term>
/// <description>The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.</description>
/// </item>
/// <item>
/// <term>lParam</term>
/// <description>Handle to the combo box.</description>
/// </item>
/// </list>
/// </summary>
CBN_SELENDCANCEL=10,
/// <summary>
/// Sent when a new item has been inserted in the control. This notification code is sent in the form of a WM_NOTIFY message.
/// <list>
/// <item>
/// <term>lParam</term>
/// <description>
/// A pointer to an <see cref="NMCOMBOBOXEX"/> structure containing information about the notification code and the item that was inserted.
/// </description>
/// </item>
/// </list>
/// </summary>
CBEN_INSERTITEM=CBEN_FIRST-1,
/// <summary>
/// Sent when an item has been deleted. This notification code is sent in the form of a WM_NOTIFY message.
/// <list>
/// <item>
/// <term>lParam</term>
/// <description>
/// A pointer to an <see cref="NMCOMBOBOXEX"/> structure that contains information about the notification code and the deleted item.
/// </description>
/// </item>
/// </list>
/// </summary>
CBEN_DELETEITEM=CBEN_FIRST-2,
/// <summary>
/// Sent when the user activates the drop-down list or clicks in the control's edit box. This notification code is sent in the form of a WM_NOTIFY message.
/// <list>
/// <item>
/// <term>lParam</term>
/// <description>A pointer to an <see cref="NMHDR"/> structure that contains information about the notification code.</description>
/// </item>
/// </list>
/// </summary>
CBEN_BEGINEDIT=CBEN_FIRST-4,
/// <summary>
/// Sent when the user has concluded an operation within the edit box or has selected an item from the control's drop-down list. This notification
/// code is sent in the form of a WM_NOTIFY message.
/// <list>
/// <item>
/// <term>lParam</term>
/// <description>A pointer to an <see cref="NMCBEENDEDIT"/> structure that contains information about how the user concluded the edit operation.</description>
/// </item>
/// </list>
/// </summary>
CBEN_ENDEDITA=CBEN_FIRST-5,
/// <summary>
/// Sent when the user has concluded an operation within the edit box or has selected an item from the control's drop-down list. This notification
/// code is sent in the form of a WM_NOTIFY message.
/// <list>
/// <item>
/// <term>lParam</term>
/// <description>A pointer to an <see cref="NMCBEENDEDIT"/> structure that contains information about how the user concluded the edit operation.</description>
/// </item>
/// </list>
/// </summary>
CBEN_ENDEDITW=CBEN_FIRST-6,
/// <summary>
/// Sent to retrieve display information about a callback item. This notification code is sent in the form of a WM_NOTIFY message.
/// <list>
/// <item>
/// <term>lParam</term>
/// <description>A pointer to an <see cref="NMCOMBOBOXEX"/> structure that contains information about the notification code.</description>
/// </item>
/// </list>
/// </summary>
CBEN_GETDISPINFO=CBEN_FIRST-7,
/// <summary>
/// Sent when the user begins dragging the image of the item displayed in the edit portion of the control. This notification code is sent in the form
/// of a WM_NOTIFY message.
/// <list>
/// <item>
/// <term>lParam</term>
/// <description>A pointer to a <see cref="NMCBEDRAGBEGIN"/> structure that contains information about the notification code.</description>
/// </item>
/// </list>
/// </summary>
CBEN_DRAGBEGIN=CBEN_FIRST-9,
}
/// <summary>
/// To create a combo box using the CreateWindow or CreateWindowEx function, specify the COMBOBOX class, appropriate window style constants, and a
/// combination of the following combo box styles.
/// <summary>Displays the list box at all times. The current selection in the list box is displayed in the edit control.</summary>
CBS_SIMPLE=0x0001,
/// <summary>Similar to CBS_SIMPLE, except that the list box is not displayed unless the user selects an icon next to the edit control.</summary>
CBS_DROPDOWN=0x0002,
/// <summary>
/// Similar to CBS_DROPDOWN, except that the edit control is replaced by a static text item that displays the current selection in the list box.
/// </summary>
CBS_DROPDOWNLIST=0x0003,
/// <summary>
/// Specifies that the owner of the list box is responsible for drawing its contents and that the items in the list box are all the same height. The
/// owner window receives a WM_MEASUREITEM message when the combo box is created and a WM_DRAWITEM message when a visual aspect of the combo box has changed.
/// </summary>
CBS_OWNERDRAWFIXED=0x0010,
/// <summary>
/// Specifies that the owner of the list box is responsible for drawing its contents and that the items in the list box are variable in height. The
/// owner window receives a WM_MEASUREITEM message for each item in the combo box when you create the combo box and a WM_DRAWITEM message when a
/// visual aspect of the combo box has changed.
/// </summary>
CBS_OWNERDRAWVARIABLE=0x0020,
/// <summary>
/// Automatically scrolls the text in an edit control to the right when the user types a character at the end of the line. If this style is not set,
/// only text that fits within the rectangular boundary is allowed.
/// </summary>
CBS_AUTOHSCROLL=0x0040,
/// <summary>
/// Converts text entered in the combo box edit control from the Windows character set to the OEM character set and then back to the Windows
/// character set. This ensures proper character conversion when the application calls the CharToOem function to convert a Windows string in the
/// combo box to OEM characters. This style is most useful for combo boxes that contain file names and applies only to combo boxes created with the
/// CBS_SIMPLE or CBS_DROPDOWN style.
/// </summary>
CBS_OEMCONVERT=0x0080,
/// <summary>Automatically sorts strings added to the list box.</summary>
CBS_SORT=0x0100,
/// <summary>
/// Specifies that an owner-drawn combo box contains items consisting of strings. The combo box maintains the memory and address for the strings so
/// the application can use the CB_GETLBTEXT message to retrieve the text for a particular item.
/// </summary>
CBS_HASSTRINGS=0x0200,
/// <summary>
/// Specifies that the size of the combo box is exactly the size specified by the application when it created the combo box. Normally, the system
/// sizes a combo box so that it does not display partial items.
/// </summary>
CBS_NOINTEGRALHEIGHT=0x0400,
/// <summary>
/// Shows a disabled vertical scroll bar in the list box when the box does not contain enough items to scroll. Without this style, the scroll bar is
/// hidden when the list box does not contain enough items.
/// </summary>
CBS_DISABLENOSCROLL=0x0800,
/// <summary>Converts to uppercase all text in both the selection field and the list.</summary>
CBS_UPPERCASE=0x2000,
/// <summary>Converts to lowercase all text in both the selection field and the list.</summary>
CBS_LOWERCASE=0x4000,
}
/// <summary>
/// Sends the specified message to a window or windows. The SendMessage function calls the window procedure for the specified window and does not return
/// until the window procedure has processed the message.
/// </summary>
/// <param name="hWnd">
/// A handle to the window whose window procedure will receive the message. If this parameter is HWND_BROADCAST ((HWND)0xffff), the message is sent to
/// all top-level windows in the system, including disabled or invisible unowned windows, overlapped windows, and pop-up windows; but the message is not
/// sent to child windows.
/// </param>
/// <param name="Msg">The message to be sent.</param>
/// <summary>The NMHDR structure that contains information about the notification code.</summary>
publicNMHDRhdr;
/// <summary>
/// The zero-based index of the item being dragged. This value will always be -1, indicating that the item being dragged is the item displayed in the
/// edit portion of the control.
/// </summary>
publicintiItemId;
/// <summary>The character buffer that contains the text of the item being dragged.</summary>
publicstringszText;
}
/// <summary>
/// Contains information about the conclusion of an edit operation within a ComboBoxEx control. This structure is used with the CBEN_ENDEDIT notification code.
/// <summary>The NMHDR structure that contains information about the notification code.</summary>
publicNMHDRhdr;
/// <summary>
/// A value indicating whether the contents of the control's edit box have changed. This value is nonzero if the contents have been modified, or zero otherwise.
