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[X++] Auto expand whole tree in FormTreeControl

If you have a Tree control on your form and want to expand the whole tree with all items and subitems at once, you can use the following static method:

SysFormTreeControl::expandTree(FormTreeControl _formTreeControl, TreeItemIdx _treeItemIdx, int _toLevel = 0, int _level = 0)

For example to expand the whole tree from the root item to the inner most item:

SysFormTreeControl::expandTree(TreeCtrl, TreeCtrl.getRoot());

Or only from the current selection item down the tree:

SysFormTreeControl::expandTree(TreeCtrl, TreeCtrl.getSelection());
[X++] Auto expand whole tree in FormTreeControl
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