Header Control Notification Messages

A header control sends notification messages, in the form of WM_NOTIFY messages, to its parent window to notify it about events. The following notification messages are used with header controls.

HDN_BEGINTRACK
HDN_DIVIDERDBLCLICK
HDN_ENDTRACK
HDN_ITEMCHANGED
HDN_ITEMCHANGING
HDN_ITEMCLICK
HDN_ITEMDBLCLICK
HDN_TRACK

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