PRB: TTM_SETTOOLINFO Does Not Subclass

ID: Q154122

The information in this article applies to:

Microsoft Win32 Software Development Kit (SDK)

SYMPTOMS

When sending a ToolTip control a TTM_SETTOOLINFO message with the TTF_SUBCLASS flag set, the ToolTip will not subclass the specified window.

CAUSE

When it receives the TTM_SETTOOLINFO message, the ToolTip control does not check the TTF_SUBCLASS flag and never attempts to subclass the window. If the window is already subclassed, it will remain subclassed after sending the TTM_SETTOOLINFO message.

RESOLUTION

To have the ToolTip subclass a window, you must use the TTM_ADDTOOL message. If you need to change some tool information for a subclassed window, the existing window will remain subclassed.

STATUS

This behavior is by design.

Additional query words:

Keywords          : kbCtrl kbNTOS400 kbWinOS2000 kbToolTip kbGrpUser kbWinOS95 kbWinOS98 
Issue type        : kbprb

Last Reviewed: December 17, 1998