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Initially Open

<?php
//For use the component
YsJQuery::useComponent(YsJQueryConstant::COMPONENT_JQTREE);

$root  = new YsTreeNode('rootId');
$node0 = new YsTreeNode('node0', 'Node 0', $root);
$node1 = new YsTreeNode('node1', 'Node 1', $root);

$node00 = new YsTreeNode('node00', 'Node 00', $node0);
$node01 = new YsTreeNode('node01', 'Node 01', $node0);

$node000 = new YsTreeNode('node000', 'Node 000', $node00);
$node001 = new YsTreeNode('node001', 'Node 001', $node00);

$node10 = new YsTreeNode('node10', 'Node 10', $node1);
$node11 = new YsTreeNode('node11', 'Node 11', $node1);

$node1->setInitiallyOpen(true);
$node00->setInitiallyOpen(true);

$tree = new YsTree('treeId',$root);

?>

<button id="btnOpenDialog">Show Demo</button>

<?php echo YsUIDialog::initWidget('dialogId','style="display:none" title="Basic dialog"') ?>
  <?php  echo $tree->draw();  ?>
<?php echo YsUIDialog::endWidget() ?>

<?php

echo
YsJQuery::newInstance()
  ->onClick() // On Click
  ->in('#btnOpenDialog') // In the button with id "btnOpenDialog"
  ->execute( // DO
    YsUIDialog::build('#dialogId') // Build and open the UI Dialog
      ->_modal(true)
      ->_width(670)
      ->_height('auto')
      ->_buttons(array(
        'Ok' => new YsJsFunction('alert("Hello world")'),
        'Close' =>  new YsJsFunction(YsUIDialog::close('this')))
       )
  );
?>

Show Demo