Gridview with Hyperlink column questions

I have a GridView with 3 columns.   One of those columns is a HyperlinkField, using another column as a QueryString entry.

Code looks like this...

      <Columns>
          <asp:BoundField DataField="ContactUs_intended_for" HeaderText="Team" ReadOnly="True">
                 <HeaderStyle HorizontalAlign="Center" />
                 <ItemStyle HorizontalAlign="Center" />
          </asp:BoundField>

          <asp:BoundField DataField="ContactUs_subject" HeaderText="Subject" ReadOnly="True" >
                  <ItemStyle HorizontalAlign="Left" />
          </asp:BoundField>

          <asp:HyperLinkField 
                    DataNavigateUrlFields="ContactUs_intended_for"
                    DataNavigateUrlFormatString="Contact_Us_Details.aspx?Team={0}"
                    Text="Details..."  >
          </asp:HyperLinkField>
      </Columns>

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Works good now, as the QueryString field is filled from the column for that has the "ContactUs_intended_for" value.
Therefore, I am tjhinking that only entries that can used in the DataNavigateUrlFormatString property have to be from the GridView...  Is that true?

I need to change the source of the data for the QueryString entries to new DropDown boxes added for the following.
Team named "filterTeam"  and  Status named "filterStatus"

Can I fill the "DataNavigateUrlFields" with the  filterTeam.SelectedValue.Text, filterStatus.SelectedValue.Text  entries?
If not, is there an event that is used that I can create the DataNavigateUrlFormatString with the URL info I need?

I hope that made sense...

Bob