( <code>DefaultSelectionModel this</code>, <code>TreeNode node</code>, <code>TreeNode node</code> )\r
<div class="mdesc"><div class="short">Fires before the selected node changes, return false to cancel the change</div><div class="long">Fires before the selected node changes, return false to cancel the change<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>this</code> : DefaultSelectionModel<div class="sub-desc"></div></li><li><code>node</code> : TreeNode<div class="sub-desc">the new selection</div></li><li><code>node</code> : TreeNode<div class="sub-desc">the old selection</div></li></ul></div></div></div></td><td class="msource">DefaultSelectionModel</td></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.tree.DefaultSelectionModel-selectionchange"></a><b><a href="source/TreeSelectionModel.html#event-Ext.tree.DefaultSelectionModel-selectionchange">selectionchange</a></b> :\r
( <code>DefaultSelectionModel this</code>, <code>TreeNode node</code> )\r
( <code>DefaultSelectionModel this</code>, <code>TreeNode node</code>, <code>TreeNode node</code> )\r
<div class="mdesc"><div class="short">Fires before the selected node changes, return false to cancel the change</div><div class="long">Fires before the selected node changes, return false to cancel the change<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>this</code> : DefaultSelectionModel<div class="sub-desc"></div></li><li><code>node</code> : TreeNode<div class="sub-desc">the new selection</div></li><li><code>node</code> : TreeNode<div class="sub-desc">the old selection</div></li></ul></div></div></div></td><td class="msource">DefaultSelectionModel</td></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.tree.DefaultSelectionModel-selectionchange"></a><b><a href="source/TreeSelectionModel.html#event-Ext.tree.DefaultSelectionModel-selectionchange">selectionchange</a></b> :\r
( <code>DefaultSelectionModel this</code>, <code>TreeNode node</code> )\r