Extended Styles

The following styles can be specified in the dwExStyle parameter of the CreateWindowEx function.

Style	Description
WS_EX_ACCEPTFILES	Specifies that a window created with this style accepts drag-drop files.
WS_EX_CONTEXTHELP	Includes a question mark in the title bar of the window. When the user clicks the question mark, the cursor changes to a question mark with a pointer. If the user then clicks a child window, the child receives a WM_HELP message. The child window should pass the message to the parent window procedure, which should call the WinHelp function using the HELP_WM_HELP command. The Help application displays a pop-up window that typically contains help for the child window. WS_EX_CONTEXTHELP cannot be used with the WS_MAXIMIZEBOX or WS_MINIMIZEBOX styles.
WS_EX_CONTROLPARENT	Allows the user to navigate among the child windows of the window by using the TAB key.
WS_EX_DLGMODALFRAME	Creates a window with a double border. Unlike the WS_DLGFRAME style, an application can also specify the WS_CAPTION style to create a title bar for the window.
WS_EX_NOPARENTNOTIFY	Specifies that a child window created with this style will not send the WM_PARENTNOTIFY message to its parent window when either created or destroyed.
WS_EX_TOPMOST	Specifies that a window created with this style should be placed above all non-topmost windows and stay above them even when the window is deactivated.
WS_EX_TOOLWINDOW	Creates a tool window; that is, a window intended to be used as a floating toolbar. A tool window has a title bar that is shorter than a normal title bar, and the window title is drawn using a smaller font. A tool window does not appear in the task bar or in the window that appears when the user presses ALT+TAB.

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