treecombobox DropDownCount property
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Applies to
tcTreeComboBox component.  

Declaration
property DropDownCount: Integer;  

Description
The DropDownCount property specifies the number of items (tree nodes) which can be visible in the drop down window simultaneously. You can increase this value if you wish to let user to see more tree nodes when the list is dropped down.  

See also
DropDownWidth property.