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i do not want to collapse tree.i want alway's open tree with all chiled node

i do not want to collapse tree.i want alway's open tree with all chiled node

how can i restrict to collapse event or disable collapse.


Thanks,

There is a tree.setItemCloseable method
    tree.setItemCloseable(id,false);
will deny item closing
Also, there is a related XML attribute
    <item open="true" closeable="false"  ...