<?xml:namespace prefix = atlasToolkit />
<atlasToolkit:CascadingDropDown id=CascadingDropDown1 runat="server">
  <atlasToolkit:CascadingDropDownProperties
    ServiceMethod="GetDropDownContentsPageMethod"
    LoadingText="[Loading makes...]"
    PromptText="Please select a make"
    Category="Make"
    TargetControlID="DropDownList1">
  </atlasToolkit:CascadingDropDownProperties>
  <atlasToolkit:CascadingDropDownProperties
    ServiceMethod="GetDropDownContents"
    LoadingText="[Loading models...]"
    PromptText="Please select a model"
    Category="Model"
    TargetControlID="DropDownList2"
    ParentControlID="DropDownList1"
    ServicePath="CarsService.asmx">
  </atlasToolkit:CascadingDropDownProperties>
  <atlasToolkit:CascadingDropDownProperties
    ServiceMethod="GetDropDownContents"
    LoadingText="[Loading colors...]"
    PromptText="Please select a color"
    Category="Color"
    TargetControlID="DropDownList3"
    ParentControlID="DropDownList2"
    ServicePath="~/CascadingDropDown/CarsService.asmx">
  </atlasToolkit:CascadingDropDownProperties>
</atlasToolkit:CascadingDropDown>

[WebMethod]
public AtlasControlToolkit.CascadingDropDownNameValue[] GetDropDownContents(string knownCategoryValues, string category)
{
  // Get a dictionary of known category/value pairs
  StringDictionary knownCategoryValuesDictionary = AtlasControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
  // Perform a simple query against the data document
  return AtlasControlToolkit.CascadingDropDown.QuerySimpleCascadingDropDownDocument(Document, Hierarchy, knownCategoryValuesDictionary, category);
}

Мне надо реализовать это не на Page, а на UserControl. Вот здесь-то и поджидает неприятность. Оно не пашет. Есть варианты у кого-то?