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代碼:
//.......................展開(kāi)所有節點(diǎn)........................//
function expandTree(t:mx.controls.Tree) : Void {
var i:Number=0;
var node:mx.controls.treeclasses.TreeNode=t.getTreeNodeAt(i);
while (node != undefined){
if (t.getIsBranch(node) && ! t.getIsOpen(node)){
t.setIsOpen(node,true);
}
i++;
node=t.getNodeDisplayedAt(i);
}
}

//.......................收合所有節點(diǎn)........................//
function collapseTree(t:mx.controls.Tree) : Void {
var i:Number=0;
var node:mx.controls.treeclasses.TreeNode=t.getTreeNodeAt(i);
while (node != undefined){
if (t.getIsBranch(node) && t.getIsOpen(node)){
t.setIsOpen(node,false);
}
i++;
node=t.getNodeDisplayedAt(i);
}
}