OnAfterDropDown event
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OnAfterDropDown event
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| tcTreeComboBox component.
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| property OnAfterDropDown: TNotifyEvent;
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| The OnAfterDropDown event occurs at once the drop-down window (wich displays the tree nodes) appears below the combo-box.
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 Write this event handler if you need to perform some specific actions at once after the drop-down window appears on screen. If you need to do something (for example, specify the width of drop-down window) before it appears on screen — write OnDropDown event handler.
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| OnDropDown and OnCloseUp events;
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| DropDownWidth property.
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