I currently have this code for remote paging/sorting, I also want the server to return remotely fitlered datasets:

<ext:Store runat="server" ID="storeGridData" RemotePaging="true" RemoteSort="true"
        RemoteGroup="true" IgnoreExtraFields="true" AutoLoad="false">
        <BaseParams>
            <ext:Parameter Name="filter" Value="" Mode="Value" />
            <ext:Parameter Name="start" Value="={0}" />
            <ext:Parameter Name="limit" Value="={10}" />
            <ext:Parameter Mode="Raw" Name="cdRef" Value="#{txtCdRef}.getValue()" />
            <ext:Parameter Mode="Raw" Name="cdDate" Value="#{dateCdDate}.getValue()" />
        </BaseParams>
        <Proxy>
            <ext:HttpProxy Url="/Commission/GetSearchResults/" Method="POST" />
        </Proxy>
        <Reader>
            <ext:JsonReader Root="data" TotalProperty="total">
                <Fields>
                    <ext:RecordField Name="Id" />
                    <ext:RecordField Name="AutogenerateRef" />
                    <ext:RecordField Name="BankedAmount" />
                    <ext:RecordField Name="BankedDate" />
                    <ext:RecordField Name="BankRef" />
                    <ext:RecordField Name="CreatedByUserId" />
                    <ext:RecordField Name="DebitBalance" />
                    <ext:RecordField Name="Description" />
                    <ext:RecordField Name="MonthRef" />
                    <ext:RecordField Name="PaymentMethodId" />
                    <ext:RecordField Name="ReconciledByUserId" />
                    <ext:RecordField Name="ReconciledDate" />
                    <ext:RecordField Name="ReconciledStatus" />
                </Fields>
            </ext:JsonReader>
        </Reader>
        <SortInfo Field="Id" Direction="ASC" />
    </ext:Store>
The part where I'm setting the BaseParams for the filter string.. I have no idea what to put in there; in a previous example I saw

#{gridSearchResults}.GridFilters()
being used, but this doesnt work. How do I get the current filter (string, is it?) to pass to my controller action?