TTN_SHOWTTN_SHOW*
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TTN_SHOW


TTN_SHOW 
	idTT = (int) wParam; 
	pnmh = (LPNMHDR) lParam;

Notifies the owner window that a tooltip is about to be displayed. This notification message is sent in the form of a WM_NOTIFY message.

idTT
Identifier of the tooltip control.
pnmh
Address of an NMHDR structure.

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