Returns the component that should be added to the client's Component hierarchy. Once installed in the client's hierarchy this component will then be able to draw and receive user input.

tree	the JTree that is asking the editor to edit; this parameter can be null
value	the value of the cell to be edited
isSelected	true if the cell is to be rendered with selection highlighting
expanded	true if the node is expanded
leaf	true if the node is a leaf node
row	the row index of the node being edited
return	the component for editing