To enable tooltips for a status bar control, create the CStatusBarCtrl object with the SBT_TOOLTIPS style.
Note
If you are using a CStatusBar object to implement your status bar, use the CStatusBar::CreateEx function. It allows you to specify additional styles for the embedded CStatusBarCtrl object.
Once the tool tip has been set, it is displayed only if the part has an icon and no text, or if all of the text cannot be displayed inside the part. Tool tips are not supported in simple mode.
Sent by a tree-view control with the TVS\_SINGLEEXPAND style when the user opens or closes a tree item using a single click of the mouse. This notification code is sent in the form of a WM\_NOTIFY message.