RAD Studio VCL Reference
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TComboBox.AutoComplete Property

Positions to matching list items as you type.

Pascal
property AutoComplete: Boolean;
C++
__property Boolean AutoComplete;

AutoComplete will position to matching list values as you type, sometimes saving you keystrokes.  

As you type, the ItemIndex property is updated with the list entry that matches the characters you have entered. As you type, different list enrties may match, and ItemIndex is changed accordingly.  

There is a delay of AutoCompleteDelay milliseconds between the characters typed and the autocomplete operation. 

 

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