Hi,

I'm having a problem with Linked combo box. I want to have a combobox intially selected like linked comboboxes example. It work fine as long as the source datastore is hardcoded in the mark up. When i change the datastore to web service, it the initial country was selected after page loaded but the cities was not intially loaded until i select a country. The error is 'Cities.store.getAt()' is null or not an object. However, when i select another country the cities loaded.

<ext:ComboBox 
ID="Countries"
StoreID="PropinsiStore"
runat="server"
Editable="false"
TypeAhead="true"
Mode="Local"
ForceSelection="true"
TriggerAction="All"
DisplayField="ID"
ValueField="NAME" 
SelectOnFocus="true"
SelectedItem="0"
EmptyText="Select a country"> 
<Listeners>
<Select Handler="#{Cities}.clearValue();#{CitiesStore}.load();" />
</Listeners>
</ext:ComboBox>
and the data strore

<ext:Store runat="server" ID="CitiesStore">
<Proxy>
<ext:HttpProxy runat="server" Method="POST" Url="Countries.asmx/GetCountries" />
</Proxy>
<Reader>
<ext:XmlReader Record="City">
<Fields>
<ext:RecordField Name="id" Type="String" Mapping="Id" />
<ext:RecordField Name="name" Type="String" Mapping="Name" /> 
</Fields>
</ext:XmlReader>
</Reader>
</ext:Store>
the GetCountries method is very simple just add countries



data.Add(new Countries("BE", "Belgium"));
data.Add(new Countries("BR", "Brazil"));
Can anybody point me how to solve this problem?