GridView's selection isn't causing other GridView's to load data asexpected

[Rasika WIJAYARATNE]

Hi everyone,

I have two grid-views and I am trying to populate the data on gv2
based on the selection in gv1. However when a row is selected in gv1,
it doesn't populate the gv2 with data. I have ensured that the
ObjectDataSourc e (ods2) for gv2 works and load data correctly by
specifying hardcoded primary key value within a Paramater.

Anyone know what is a miss here to prevent gv2 from loading it's
data???
[Grid where rows are selected from.]
<asp:GridView ID="gv1" runat="server" AllowPaging="Tr ue"
AllowSorting="T rue"
AutoGenerateCol umns="False" DataSourceID="o ds1"
DataKeyNames="m yID">
<Columns>
<asp:CommandFie ld ShowSelectButto n="True" />
...
</Columns>
</asp:GridView>
[Grid where sub-details rows are displayed based on above
selection.]
<asp:GridView ID="gv2" runat="server" AutoGenerateCol umns="False"
DataSourceID="o ds2">
<Columns>
...
</Columns>
</asp:GridView>
[Data source for getting the sub-details for gv2, based on
selection in gv1.]
<asp:ObjectData Source ID="ods2" runat="server"
OldValuesParame terFormatString ="original_{ 0}"
SelectMethod="G etData"
TypeName="MyTab leAdapters.MyTa bleAdapter">
<SelectParamete rs>
<asp:ControlPar ameter ControlID="gv1" Name="myID"
PropertyName="S electedValue" Type="Int32" />
</SelectParameter s>
</asp:ObjectDataS ource>