RowTracking Property
This property controls whether rows are automatically highlighted as the mouse is moved over the drop-down portion of a TDBCombo control.
TDBCombo.RowTracking= boolean
Read/Write at run time and design time.
Property applies to TDBCombo control.
If True (the default), individual rows are highlighted as the mouse moves over them.
If False, moving the mouse does not change the highlighted row.
Note: When RowTracking is True and the user highlights a different row by moving the mouse, the ItemChange event will not fire.