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Bindind hidden properties between two grids

Hello together,

as this is my first post on this forums and am new to telerik components, please be gentle, if this is a dumb question. ;-)

I try to use two RadGrids which are linked together:

<telerik:RadGrid ID="rgCompanies" runat="server"
        AllowPaging="True" AllowAutomaticUpdates="False" AllowAutomaticInserts="False"
        AllowAutomaticDeletes="False" AllowSorting="true"
        DataSourceID="Companies">
        <MasterTableView AutoGenerateColumns="False"
            DataKeyNames="CompanyId">
            <Columns>
                <telerik:GridBoundColumn DataField="CompanyId" HeaderText="Nr." SortExpression="CompanyId"
                    UniqueName="CompanyId" Visible="true" ReadOnly="true" MaxLength="5">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="CompanyName" HeaderText="Unternehmensname" SortExpression="CompanyName"
                    UniqueName="CompanyName" Visible="true" ItemStyle-Width="150" DataFormatString="{0}" ReadOnly="true">
                </telerik:GridBoundColumn>
            </Columns>
        </MasterTableView>
        <ClientSettings AllowKeyboardNavigation="true" EnablePostBackOnRowClick="true">
            <Selecting AllowRowSelect="true"></Selecting>
        </ClientSettings>
    </telerik:RadGrid>

and

<telerik:RadGrid ID="rgProducts" runat="server" AllowPaging="True" AllowAutomaticUpdates="True" AllowAutomaticInserts="True"

AllowAutomaticDeletes="True" AllowSorting="true"

DataSourceID="Products">

<MasterTableView AutoGenerateColumns="False"

DataKeyNames="ProductId" CommandItemDisplay="Top" >

<Columns>

<telerik:GridEditCommandColumn ButtonType="ImageButton" UniqueName="EditCommandColumn" ShowSortIcon="false">

<HeaderStyle ForeColor="DimGray" Width="20px" />

<ItemStyle HorizontalAlign="Center" />

</telerik:GridEditCommandColumn>

<telerik:GridButtonColumn ConfirmText="Dieses Produkt wirklich löschen?" ConfirmDialogType="RadWindow"

ConfirmTitle="Löschen" ButtonType="ImageButton" CommandName="Delete" />

<telerik:GridBoundColumn DataField="ProductId" HeaderText="Nr." SortExpression="ProductId"

UniqueName="ProductId" Visible="true" ReadOnly="true" MaxLength="5">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="Grammage" HeaderText="Grammatur" SortExpression="Grammage"

UniqueName="Grammage1" Visible="true" ReadOnly="false" DataFormatString="{0} g/m²">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="Width" HeaderText="Breite" SortExpression="Width"

UniqueName="Width" Visible="true" ReadOnly="false" DataFormatString="{0} cm">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="Height" HeaderText="Höhe" SortExpression=".Height"

UniqueName="Height" Visible="true" ReadOnly="true" DataFormatString="{0} cm">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="NumberOfPages" HeaderText="Umfang" SortExpression="NumberOfPages"

UniqueName="NumberOfPages" Visible="true" ReadOnly="true" DataFormatString="{0} Seiten">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="PrintType1.PrintTypeName" HeaderText="Drucktyp" SortExpression="PrintType1.PrintTypeName"

UniqueName="PrintType1.PrintTypeName" Visible="true" ReadOnly="true">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="Refinement1.RefinementName" HeaderText="Veredelung" SortExpression="Refinement1.RefinementName"

UniqueName="Refinement1.RefinementName" Visible="true" ReadOnly="true">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="PaperType1.PaperTypeName" HeaderText="Papersorte" SortExpression="PaperType1.PaperTypeName"

UniqueName="PaperType1.PaperTypeName" Visible="true" ReadOnly="true">

</telerik:GridBoundColumn>

</Columns>

<EditFormSettings EditFormType="Template">

<FormTemplate>

<asp:TextBox ID="tbGrammage" runat="server" Text='<%# Bind("Grammage") %>'>

</asp:TextBox>

<asp:TextBox ID="tbWidth" runat="server" Text='<%# Bind("Width") %>'>

</asp:TextBox>

<asp:TextBox ID="tbHeight" runat="server" Text='<%# Bind("Height") %>'>

</asp:TextBox>

<asp:TextBox ID="tbNumberOfPages" runat="server" Text='<%# Bind("NumberOfPages") %>'>

</asp:TextBox>

<asp:DropDownList ID="ddlPrintType" runat="server" SelectedValue='<%# Bind("PrintType") %>' AppendDataBoundItems="true"

DataSourceID="PrintTypes" DataValueField="PrintTypeId" DataTextField="PrintTypeName">

</asp:DropDownList>

<asp:DropDownList ID="ddlPaperType" runat="server" SelectedValue='<%# Bind("PaperType") %>' AppendDataBoundItems="true"

DataSourceID="PaperTypes" DataValueField="PaperTypeId" DataTextField="PaperTypeName">

</asp:DropDownList>

<asp:DropDownList ID="ddlRefinement" runat="server" SelectedValue='<%# Bind("Refinement") %>' AppendDataBoundItems="true"

DataSourceID="Refinements" DataValueField="RefinementId" DataTextField="RefinementName">

</asp:DropDownList>

<asp:Button ID="btnUpdate" Text='<%# (Container is GridEditFormInsertItem) ? "Insert" : "Update" %>'

runat="server" CommandName='<%# (Container is GridEditFormInsertItem) ? "PerformInsert" : "Update" %>'></asp:Button>

<asp:Button ID="btnCancel" Text="Cancel" runat="server" CausesValidation="False"

CommandName="Cancel"></asp:Button>

</FormTemplate>

</EditFormSettings>

</MasterTableView>

<ClientSettings AllowKeyboardNavigation="true" EnablePostBackOnRowClick="true">

<Selecting AllowRowSelect="true"></Selecting>

</ClientSettings>

</telerik:RadGrid>

and the DataSources:

<asp:EntityDataSource ID="Companies" runat="server"