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## com.gwtext.client.widgets.tree
Interface NodeExpansionCallback

    public interface NodeExpansionCallback

Callback interface invoked on an expandable node.

See Also:
  `TreePanel.expandPath(String, NodeExpansionCallback)`

Method Summary
`void` | `onExpand(boolean success, TreeNode lastNode)` The callback method to call when the expand is complete.

Method Detail

### onExpand

    void onExpand(boolean success,
                  TreeNode lastNode)

  The callback method to call when the expand is complete. The callback will be called with (success, lastNode) where success is if the expand was successful and lastNode is the last node that was expanded.

  Parameters:
    `success` - true if expand successful
    `lastNode` - the last node expanded

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