Hi,
Please note that you can override onBeforeDrag in TreePanel's DragConfig.
Example
<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Ext.Net Example</title>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" />
<ext:TreePanel
runat="server"
AutoHeight="true"
RootVisible="false"
EnableDD="true">
<Root>
<ext:TreeNode>
<Nodes>
<ext:TreeNode Text="I'm not draggable">
<CustomAttributes>
<ext:ConfigItem Name="myAllowDrag" Value="false" />
</CustomAttributes>
</ext:TreeNode>
<ext:TreeNode Text="I'm draggable" >
<CustomAttributes>
<ext:ConfigItem Name="myAllowDrag" Value="true" />
</CustomAttributes>
</ext:TreeNode>
<ext:TreeNode Text="I'm not draggable">
<CustomAttributes>
<ext:ConfigItem Name="myAllowDrag" Value="false" />
</CustomAttributes>
</ext:TreeNode>
</Nodes>
</ext:TreeNode>
</Root>
<DragConfig runat="server">
<OnBeforeDrag Handler="var n = data.node;
return n && n.draggable && !n.disabled && n.attributes.myAllowDrag;" />
</DragConfig>
</ext:TreePanel>
</form>
</body>
</html>
