Data Controls :: GridView Edit - TextBoxes Are Always Empty

.I have a GridView, a PopupExtender and a Button (button is located next to the GridView). The GridView has textboxes and dropdownlists. Initially, the GridView has one empty row (i.e. the textboxes are empty, and the dropdownlist show "blank" option.)When you click on the button "AddFlowButton", a Popupextender shows up, with several textboxes and dropdownlists, and two Buttons ("AddCashFlowButton" and "CancelButton"). Once you fill out the PopupExtender, and click the "AddCashFlowButton" button in the extender, the GridView is populated using the values in the PopupExtender.The problem now is that when I click on the edit button next to a GridView row, the GridView becomes empty, i.e. the textboxes become empty and the dropdownlists show empty values.Here is the code:

ASPX:

<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<asp:Panel ID="FlowPanel" runat="server" CssClass="modalPopup">
<table>
<tr valign="top">
<td>
Name

[code]....