Knowledge Base

PRB: TTM_SETTOOLINFO Does Not Subclass

Article ID: 154122

Article Last Modified on 7/11/2005

APPLIES TO

This article was previously published under Q154122

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.

Keywords: kbtooltip kbprb kbctrl KB154122


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