TTN_SHOW notification code
Notifies the owner window that a tooltip control is about to be displayed. This notification code is sent in the form of a WM_NOTIFY message.
Pointer to an NMHDR structure.
Note For versions earlier than 4.70, there is no return value.
A tooltip window rectangle is somewhat larger than its text display rectangle, and its origin is offset up and to the left. If you need to accurately position the text display rectangle of a tooltip, the TTM_ADJUSTRECT message converts a text display rectangle into the corresponding tooltip window rectangle and vice versa.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|