RadAjaxLoadingPanel has default z-index set to 90000. To change this default setting, you can use one of the approaches below, based on the way the loading panel is configured:

• CopyRadAjaxLoadingPanel uses Skin

  <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Vista" />

  In this case you can directly use the ZIndex property of the control:

  Copyusing ZIndex

  <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server"
  Skin="Vista" ZIndex="3000" />

• CopyRadAjaxLoadingPanel has a template defined

  <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" >
  <img alt="loading..." src="loading.gif" />
  </telerik:RadAjaxLoadingPanel>

  Here to set the desired z-index, you should use inline CSS:

  Copyusing inline CSS

  <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server"
  style="z-index:3000;">
  <img alt="loading..." src="loading.gif" />
  </telerik:RadAjaxLoadingPanel>