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TComponentCombo Properties, TComponentCombo Class
EControl Form Designer Pro
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TComponentCombo.OnDropDown Property
TComponentCombo Properties | TComponentCombo Class
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Occurs when the user opens the drop-down list by clicking the arrow at the right of the control.

property OnDropDown;
Description

Write an OnDropDown event handler to implement special processing that needs to occur only when the drop-down list is activated.

Notes

OnDropDown never occurs if the combo box does not include any items.

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