headerpanel OnMouseEnter event
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Applies to
acLabel, acURLLabel, acRichLabel, acCheckBox, acRadioButton, acButton, acBitBtn, acEdit, acNumberEdit, acMRUComboBox, acHeader, acHeaderPanel, acTreeView, acListView components.  

property OnMouseEnter: TNotifyEvent;  

The OnMouseEnter occurs when mouse pointer hovers the header panel.  
tip If you wish to be notified when mouse hovers the header of the control — use OnHeaderMouseEnter event.  

See also
OnMouseLeave, OnHeaderMouseEnter and OnHeaderMouseLeave events.