Hello .. I have the following working component:

<ig:WebDropDown ID="wddCoType" runat="server" DropDownContainerMaxHeight="500px"
DropDownContainerWidth="290px" Height="20px" Width="280px" AutoPostBack="True" CssClass="wddMarginFix"
DisplayMode="DropDownList" EnableClosingDropDownOnSelect="true"
DropDownContainerHeight="320px">
<%--CssClass="wddSmallFnt wddMarginFix"--%>
<Items>
<ig:DropDownItem>
</ig:DropDownItem>
</Items>
<ItemTemplate>
<ig:WebDataTree ID="wdtCoType" runat="server" DataSourceID="whds" Height="300px"
Width="250px" OnSelectionChanged="wdtCoType_SelectionChanged" SelectionType="Single">
<ClientEvents SelectionChanging="wdtCoType_SelectionChanging" SelectionChanged="wdtCoType_SelectionChanged" />
<DataBindings>
<ig:DataTreeNodeBinding DataMember="SqlDSCategory_DefaultView" KeyField="CATEGORY_ID"
TextField="DESC" ValueField="CATEGORY_ID" />
<ig:DataTreeNodeBinding DataMember="SqlDSBizCat_DefaultView" KeyField="CATEGORY_ID"
TextField="TYPE_DESC" ValueField="TYPE_ID" />
<ig:DataTreeNodeBinding DataMember="SqlDSBizCodes_DefaultView" KeyField="TYPE_ID"
TextField="descr" ValueField="CODE" />
</DataBindings>
</ig:WebDataTree>
</ItemTemplate>
</ig:WebDropDown>
<ig:WebHierarchicalDataSource ID="whds" runat="server">
<DataViews>
<ig:DataView ID="SqlDSCategory_DefaultView" DataMember="DefaultView" DataSourceID="SqlDSCategory" />
<ig:DataView ID="SqlDSBizCat_DefaultView" DataMember="DefaultView" DataSourceID="SqlDSBizCat" />
<ig:DataView ID="SqlDSBizCodes_DefaultView" DataMember="DefaultView" DataSourceID="SqlDSBizCodes" />
</DataViews>
<DataRelations>
<ig:DataRelation ChildColumns="CATEGORY_ID" ChildDataViewID="SqlDSBizCat_DefaultView"
ParentColumns="CATEGORY_ID" ParentDataViewID="SqlDSCategory_DefaultView" />
<ig:DataRelation ChildColumns="TYPE_ID" ChildDataViewID="SqlDSBizCodes_DefaultView"
ParentColumns="TYPE_ID" ParentDataViewID="SqlDSBizCat_DefaultView" />
</DataRelations>
</ig:WebHierarchicalDataSource>
<asp:SqlDataSource ID="SqlDSBizCodes" runat="server" ConnectionString="<%$ ConnectionStrings:JNJ GTW %>"
SelectCommand="select bc.TYPE_ID, bc.CODE + space(3) + bc.[DESC] as descr , bc.CODE
from dbo.bizcodes bc
order by BC.[ORDER]"></asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDSBizCat" runat="server" ConnectionString="<%$ ConnectionStrings:JNJ GTW %>"
SelectCommand="select ct.CATEGORY_ID , ct.TYPE_DESC, ct.TYPE_ID
from dbo.BIZ_CATEGORY_TYPE ct"></asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDSCategory" runat="server" ConnectionString="<%$ ConnectionStrings:JNJ GTW %>"
SelectCommand="SELECT [DESC], CATEGORY_ID FROM CATEGORY AS ca WHERE (CODE = 1)"></asp:SqlDataSource>

I need to accomplish the following : dynamically assign connection strings instead of the one macro substituted in templates.

In regular drop downs I just remove ConnectionString rom the component mark up and put into the Page_Init  the following expression:

SqlDSBizCodes.ConnectionString = ConfigurationManager.ConnectionStrings[_sessionTDUToken.dbConnectionName].ConnectionString;

It works everywhere except this particular component.. If I remove  all three ConnectionString="<%$ ConnectionStrings:JNJ GTW %>" and put three ConfigurationManager expression into Page_Init  it blows up with : "The ConnectionString property has not been initialized." 

Would you advise how to dynamically change reference to the connection string in this particular scenario.. again the method works for all other WebDropDown(s) 

Thanks.