These window class styles are available:

CS_SIZEREDRAW

Determines whether a window will be redrawn when sized. This style is to be used for a window whose contents are sensitive to the size of the window. For example, the data in some windows can be scaled up or down to fit the size of the Client Area. In other windows, the data remains the same size whatever the size of the window; it is merely clipped if the window is made smaller. The CS_SIZEREDRAW style is to be used in the first instance but not in the second. For more information, see WM_CALCVALIDRECTS.
CS_SYNCPAINT
Window is synchronously repainted. This style causes WS_SYNCPAINT to be set for all windows of this class.
CS_MOVENOTIFY
This class style should be used by a child window if it wants to be notified with a WM_MOVE message when its parent is moved. For more detail, see the WM_MOVE message description.
CS_CLIPCHILDREN
Causes a window of style WS_CLIPCHILDREN to be created, regardless of whether this style bit is specified on the create window function.
CS_CLIPSIBLINGS
Causes a window of style WS_CLIPSIBLINGS to be created, regardless of whether this style bit is specified on the create window function.
CS_PARENTCLIP
Causes a window of style WS_PARENTCLIP to be created, regardless of whether this style bit is specified on the create window function.
CS_SAVEBITS
Causes a window of style WS_SAVEBITS to be created, regardless of whether this style bit is specified on the create window function.
CS_PUBLIC
Causes a public window class to be registered. It is an error if this parameter is specified on any process other than the shell process.
CS_HITTEST
If set, causes a WM_HITTEST message to be sent to the window, before sending any pointing device message.

If not set, no WM_HITTEST message is sent, and it is assumed that the window returns HT_NORMAL if the window is not disabled, and HT_ERROR if the window is disabled.

Top-level frame windows do not have CS_HITTEST set.

CS_FRAME
If set, all windows of this class are expected to behave as frame windows.

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