RAD Studio VCL Reference
TComboBox.AutoDropDown Property

Specifies whether the drop-down list drops down automatically in response to user keystrokes.

property AutoDropDown: Boolean;
__property Boolean AutoDropDown;

When AutoDropDown is true, the combo box automatically drops down its list when the user starts typing a string while the combo box has focus. 

When AutoDropDown is false, the user must explicitly use the drop-down button to drop down the combo box list. 


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