Problem with reloading Grid with Templatecolumns

I am having this same problem - my template columns (editor templates) are defined in the markup but if I rebind the WebDataGrid on a postback, which is necessary in certain situations, I get an error regarding multiple controls with the same Id "Header1". This is driving me nuts - I do have an open case so no need to ask about it - here is the markup of my WebDataGrid (note is is hosted in a WebTab control with EnableAjax and EnableLoadOnDemand flags set to true).

ig:WebDataGrid ID="OpenCommitmentsWebDataGrid" runat="server" Width="100%" Height

="320px"

StyleSetPath="~/App_Styles" StyleSetName="Windows7" DataKeyFields="OpenCommitmentID"

AutoGenerateColumns="False" EnableAjax="false" EnableAjaxViewState

="false"

EnableViewState="true" EnableDataViewState

="true"

OnInitializeRow="OpenCommitmentsWebDataGrid_InitializeRow"

<AjaxIndicator Enabled="true"

<EmptyRowsTemplate

<div class

="center">

<br

<span class="small-black-bold-label">No Open Commitments Found.</span

<br

</div

</EmptyRowsTemplate

<ig:EditingCore

<Behaviors

<ig:CellEditing Enabled

="true">

<ColumnSettings

<ig:EditingColumnSetting ColumnKey="OrganizationID" ReadOnly="true"

<ig:EditingColumnSetting ColumnKey="ProjectID" ReadOnly="true"

<ig:EditingColumnSetting ColumnKey="PurchaseOrder" ReadOnly="true"

<ig:EditingColumnSetting ColumnKey="LineItem" ReadOnly="true"

<ig:EditingColumnSetting ColumnKey="VendorName" ReadOnly="true"

<ig:EditingColumnSetting ColumnKey="OpenCommitmentAmount" ReadOnly="true"

<ig:EditingColumnSetting ColumnKey="Accrue" ReadOnly="false"

EditorID="OpenCommitmentsWebDataGrid_DropDownProvider1"

<ig:EditingColumnSetting ColumnKey="AccrueAmount" ReadOnly="false"

EditorID="OpenCommitmentsWebDataGrid_CurrencyEditorProvider1"

<ig:EditingColumnSetting ColumnKey="AccrueReasonID" ReadOnly="false"

EditorID="OpenCommitmentsWebDataGrid_DropDownProvider2"

</ColumnSettings

<EditModeActions MouseClick="Single"

</ig:CellEditing

</Behaviors

</ig:EditingCore

</Behaviors

<Columns

<ig:BoundDataField Key="OpenCommitmentID" DataFieldName="OpenCommitmentID" Hidden="true"

<ig:TemplateDataField Key="RowCheck" Width

="3%">

<ItemTemplate

<asp:CheckBox ID="RowCheckBox" runat="server" CssClass="checkbox" Text=""

</ItemTemplate

<HeaderTemplate

<asp:CheckBox ID="HeaderCheckBox" runat="server" CssClass="checkbox" Text="" onclick="return HeaderCheckedChanged(this);"

</HeaderTemplate

</ig:TemplateDataField

<ig:BoundDataField Key="OrganizationID" DataFieldName="OrganizationID" Width

="10%">

<Header Text="Organization ID"

</ig:BoundDataField

<ig:BoundDataField Key="ProjectID" DataFieldName="ProjectID" Width="20%" CssClass

="Left">

<Header Text="Project ID"

</ig:BoundDataField

<ig:BoundDataField Key="PurchaseOrder" DataFieldName="PurchaseOrder" Width

="10%">

<Header Text="PO"

</ig:BoundDataField

<ig:BoundDataField Key="LineItem" DataFieldName="LineItem" Width

="5%">

<Header Text="Line #"

</ig:BoundDataField

<ig:BoundDataField Key="VendorName" DataFieldName="VendorName" Width="15%" CssClass

="Left">

<Header Text="Vendor Name"

</ig:BoundDataField

<ig:BoundDataField Key="OpenCommitmentAmount" DataFieldName="OpenCommitmentAmount" DataFormatString="{0:C}"

Width="10%" CssClass

="Right">

</ig:BoundDataField

<ig:BoundDataField Key="Accrue" DataFieldName="Accrue" Width="6%" DataType

="Boolean">

<Header Text="Accrue?"

</ig:BoundDataField

<ig:BoundDataField Key="AccrueAmount" DataFieldName="AccrueAmount" Width="12%" DataFormatString="{0:C}" CssClass

="Right">

<Header Text="Accrue Amount"

</ig:BoundDataField

<ig:BoundDataField Key="AccrueReasonID" DataFieldName="AccrueReasonID" Width

="6%">

<Header Text="Comment"

</ig:BoundDataField

</Columns

<EditorProviders

<ig:CurrencyEditorProvider ID

="OpenCommitmentsWebDataGrid_CurrencyEditorProvider1">

<EditorControl ID="EditorControl1" runat="server" MaxDecimalPlaces="2" MinDecimalPlaces="2" StyleSetName="Default"

StyleSetPath="~/App_Styles" Font-Names="Verdana, Arial" Font-Size

="10px">

</EditorControl

</ig:CurrencyEditorProvider

<ig:DropDownProvider ID

="OpenCommitmentsWebDataGrid_DropDownProvider1">

<EditorControl ID="EditorControl2" runat="server" DropDownContainerHeight="100px"

DropDownContainerMaxHeight="100px" EnableAnimations="False" DisplayMode="DropDownList"

EnableDropDownAsChild="False" StyleSetName="Default" StyleSetPath

="~/App_Styles"

Font-Name="Verdana, Arial" Font-Size="10px" ValueField

="Accrue">

<Items

<ig:DropDownItem Value="" Text=""></ig:DropDownItem

<ig:DropDownItem Value="False" Text="No"></ig:DropDownItem

<ig:DropDownItem Value="True" Text="Yes"></ig:DropDownItem

</Items

</EditorControl

</ig:DropDownProvider

<ig:DropDownProvider ID

="OpenCommitmentsWebDataGrid_DropDownProvider2">

<EditorControl ID="EditorControl3" runat="server" DropDownContainerHeight

="100px"

DropDownContainerMaxHeight="100px" EnableAnimations="False" DisplayMode="DropDownList"

EnableDropDownAsChild="False" StyleSetName="Default" StyleSetPath

="~/App_Styles"

Font-Names="Verdana, Arial" Font-Size="10px" ValueField

="AccrueReasonID">

<Items

<ig:DropDownItem Value="" Text=""></ig:DropDownItem

<ig:DropDownItem Value="1" Text="DEO"></ig:DropDownItem

<ig:DropDownItem Value="2" Text="IMA"></ig:DropDownItem

<ig:DropDownItem Value="3" Text="GRA"></ig:DropDownItem

</Items

</EditorControl

</ig:DropDownProvider

</EditorProviders

</ig:WebDataGrid