Behind Code :  

	Public Sub MajGrid()

		whdgReponse.Visible = True

        	Dim idPosteDQE As Long = Francelot.Util.RetourneIdPosteDQE(idPosteEntreprise)
        	Dim BddArtisan As New dcExiaDataContext

        	Dim reqModeleComposanteVentilation = From n In BddArtisan.DQE_ModeleComposanteVentilation(idPosteDQE)
	        Dim reqComposanteVentilation = From n In BddArtisan.DQE_ComposanteVentilation(idPosteDQE)

        	Dim dtModeleComposanteVentilation As DataTable = Francelot.Util.ToDataTable(BddArtisan, reqModeleComposanteVentilation)
	        dtModeleComposanteVentilation.TableName = "tModeleVentilation"
	
        	Dim key(0) As DataColumn
	        key(0) = dtModeleComposanteVentilation.Columns(0)
        	dtModeleComposanteVentilation.PrimaryKey = key

        	Dim dtComposanteVentilation As DataTable = Francelot.Util.ToDataTable(BddArtisan, reqComposanteVentilation)
	        With dtComposanteVentilation.Columns
            	    .Add("decPrixUnitaireHT", GetType(Decimal))
	            .Add("decTotalHT", GetType(Decimal))
	        End With
        
		dtComposanteVentilation.TableName = "tCompoVentilation"

	        Dim ds As New DataSet
        	ds.Tables.Add(dtModeleComposanteVentilation)
	        ds.Tables.Add(dtComposanteVentilation)

	        ds.Relations.Add("R", ds.Tables("tModeleVentilation").Columns("idModeleVentilationMarche"), ds.Tables("tCompoVentilation").Columns("idModeleVentilationMarche"), False)
        	With whdgReponse
	            .DataSource = ds
            	    .DataBind()
	        End With
	
	End Sub


Source Code : 

	
		 <ig:WebHierarchicalDataGrid ID="whdgReponse" runat="server" Height="550px" Width="1050px" style="position:absolute; top:150px" Visible="False" 
                        DataKeyFields="idModeleVentilationMarche" AutoGenerateColumns="False" AutoGenerateBands="False" DataMember="tModeleVentilation" InitialExpandDepth="1" InitialDataBindDepth="3"> 
                        <Columns>
                            <ig:BoundDataField DataFieldName="idModeleVentilationMarche" Key="idModeleVentilationMarche" Hidden="true"></ig:BoundDataField>
                            <ig:BoundDataField DataFieldName="strLibelleModeleVentilation" Key="strLibelleModeleVentilation"></ig:BoundDataField>
                        </Columns>
                        <Bands>
                            <ig:Band AutoGenerateColumns="false" DataKeyFields="idModeleVentilationMarche" DataMember="tCompoVentilation">
                                <Columns>
                                    <ig:BoundDataField DataFieldName="idModeleVentilationMarche" Key="idModeleVentilationMarche" Hidden="true"></ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="idComposanteVentilationDQE" Key="idComposanteVentilationDQE" Hidden="true"></ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="idComposanteVentilationDQEPerso" Key="idComposanteVentilationDQEPerso" Hidden="true"></ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="Libelle" Key="Libelle" Width="600px"></ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="Unite" key="Unite" Header-Text="U" Width="50px">
                                        <Header Text="U">
                                        </Header>
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="DecQuantite" Key="DecQuantite" Header-Text="Q" Width="70px">
                                        <Header Text="Q">
                                        </Header>
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="decPrixUnitaireHT" Key="decPrixUnitaireHT" Header-Text="Pu HT" Width="70px">
                                        <Header Text="Pu HT">
                                        </Header>
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="decTotalHT" Key="decTotalHT" Header-Text="Total HT" Width="70px">
                                        <Header Text="Total HT">
                                        </Header>
                                    </ig:BoundDataField>
                                </Columns>
                                <Behaviors>
                                    <ig:EditingCore EnableInheritance="True">
                                        <Behaviors>
                                            <ig:CellEditing EnableInheritance="true">
                                               <EditModeActions MouseClick="Single" />
                                                <ColumnSettings >
                                                    <ig:EditingColumnSetting ColumnKey="Libelle" ReadOnly="true" />
                                                    <ig:EditingColumnSetting ColumnKey="Unite" ReadOnly="true" />
                                                    <ig:EditingColumnSetting ColumnKey="decTotalHT" ReadOnly="true" />
                                                </ColumnSettings>
                                            </ig:CellEditing>
                                        </Behaviors>
                                    </ig:EditingCore>
                                </Behaviors>
                            </ig:Band>
                       </Bands>
                    </ig:WebHierarchicalDataGrid>