treecombobox SelectedNode property
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Applies to
tcTreeComboBox component.  

property SelectedNode: TTreeNode; // read-only!!  

The SelectedNode is the read-only property which returns the pointer to TTreeNode object, which currently selected in the TreeView control embedded to drop-down window.  
tip Alternatively you can determinate and specify the selected tree node by its absolute index using ItemIndex property.  

See also
ItemIndex property;  
OnCanSelectNode event.