treecombobox OnAfterDropDown event
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Applies to
acTreeComboBox component.  

property OnAfterDropDown: TNotifyEvent;  

The OnAfterDropDown event occurs at once the drop-down window (wich displays the tree nodes) appears below the combo-box.  
tip 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.  

See also
OnDropDown and OnCloseUp events;  
DropDownWidth property.