VS 2012 - Repopulating Cbo2 Based On Selection Of Cbo1 In GridView

I have an web app I'm developing and it contains a form with a gridview. The grid view has 2 dropdowns...cbo1, and cbo2

The gridview is in Edit mode and when I select something from cbo1, i need to re-populate cbo2.

Here's the source code that shows my grid and dropdowns:

Code:
<asp:GridView id="gridOutdoor" EnableViewState="false" onrowdatabound="gridOutdoor_RowDataBound" onrowediting="gridOutdoor_RowEditing" AutoGenerateColumns="False" runat="server" PageSize="5" CssClass="GridView" BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" CellPadding="4" >
<Columns>
<asp:CommandField ShowEditButton="True" />

[Code] ...

Here's the sqlDataSource that's also in the source page:

Code:
<%-- cbo1--%>
<asp:SqlDataSource ID="SqlDataSourceProduct" runat="server" CancelSelectOnNullParameter="false" ConnectionString="<%$ ConnectionStrings:QuoteToolConnectionString %>"
SelectCommand="select distinct cat1 as Product from QuoteItems where accessory=0">
</asp:SqlDataSource>
<%-- cbo2--%>

[Code] ...

As you can see, for sqlDataSourceBodyColor, I have a param and it needs to get the value from the user's selection of cbo1.

In the RowDataBound event, I had set it up to get this value. It works great for the initial load of the page; but when I make a selection from cbo1, the value of cbo1 when debugging, is always what ever was first set when going into edit mode - the bound items.

here's the code for that:

Code:
Protected Sub gridOutdoor_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
Dim cbo1 As DropDownList = CType(e.Row.FindControl("ddProduct"), DropDownList)
Dim cbo2 As DropDownList = CType(e.Row.FindControl("ddBodyColor"), DropDownList)

[Code] .....