title: asp.net treeview not rendering custom expand and collapse images
body: <p>I've got a Treeview inside an Updatepanel, currently I'm developing directly on a dev server with a remote connection to it. I've set the CollapseImageUrl and ExpandImageUrl properties and when I view it on the dev servers' browser it renders fine.</p>
  
  <p>It produces:</p>
  
  <pre><code>&lt;td&gt;&lt;a id="tvPartyRolesn0" href="javascript:TreeView_ToggleNode(tvPartyRoles_Data,0,tvPartyRolesn0,' ',tvPartyRolesn0Nodes)"&gt;&lt;img src="Images/expanded.gif" alt="Expand EUGEN MAY(0)" style="border-width:0;" /&gt;&lt;/a&gt;&lt;/td&gt;&lt;td style="white-space:nowrap;"&gt;&lt;a class="tvPartyRoles_0" href="javascript:__doPostBack('tvPartyRoles','s419f4890-31ef-4216-a518-e8faabe24349')" onclick="TreeView_SelectNode(tvPartyRoles_Data, this,'tvPartyRolest0');" id="tvPartyRolest0"&gt;EUGEN MAY(0)&lt;/a&gt;&lt;/td&gt;
  </code></pre>
  
  <p>However, when I view it from my local pc (same url, exactly the same browser: IE 8) it doesn't render the expand image and the generated html is different:</p>
  
  <pre><code>&lt;td&gt;&lt;img src="/WebResource.axd?d=NqoU8iloxnxrlj-ZMUKCyamdjzSBKRr3z953sczo15w8GlcBeb28IywRWdNJp1sMt7Amde05goEj7xS55cTJgC-vUieKdef5bZnLtb6RuEJoxUlM0&amp;amp;t=634208849469717278" alt="" /&gt;&lt;/td&gt;&lt;td style="white-space:nowrap;"&gt;&lt;a class="tvPartyRoles_0" href="javascript:__doPostBack('tvPartyRoles','s419f4890-31ef-4216-a518-e8faabe24349')" onclick="TreeView_SelectNode(tvPartyRoles_Data, this,'tvPartyRolest0');" id="tvPartyRolest0"&gt;EUGEN MAY(0)&lt;/a&gt;&lt;/td&gt;
  </code></pre>
  
  <p>Any ideas why this happens?</p>