[Qgis-developer] How to Use Qgis API to Collapse or Expand a Layer?

[KSJ]

Hi All:
    I try to use qgis pyton api to collapse/expand a layer.
    I found that In legendInterface class, there's a method
"refreshLayerSymbology"
    can make the layer expand.
    But I can find method to let layer Collapsed.
    Is there a method to do it? thanks a lot.

    KSJ

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