Search and Update Gridview inside modal popup without closing the popup

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ASP.NET

Ajax-toolkit

Hi can anyone tell me how can i search and Update my User control using textChenged event on a Modal popup without closing the Popup ?

I have this Dynamic User control that containts TextBox and GridView

The Master page ImageButton supplies the GridView Datasource and the shows the User Control which displays the data

Protected Sub imgBtn2_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles imgBtn2.Click
        Dim MyController As Control = LoadControl("~/UserControl/MyUserControl.ascx")

        Dim gv As New GridView
        gv = CType(UCBranch.FindControl("gvBranch"), GridView)
        gv.DataSource = MyDatatable
        gv.DataBind()
        LoadUserContrl.Controls.Add(MyController)
        MPEUC.Show()
End Sub

This is my MyUserControl.ascx

GridView

<div class="GVData">
        <asp:GridView ID="gvBranch" runat="server" AutoGenerateColumns="False" EnableViewState="false">
            <Columns>
                <asp:BoundField DataField="BLoc" HeaderText="Location">
                </asp:BoundField>
        <asp:BoundField DataField="Bname" HeaderText="Name">
                </asp:BoundField>
            </Columns>
        </asp:GridView>
</div>

my TextBox for searching

<asp:UpdatePanel ID="UpdateP1" runat="server" UpdateMode="Conditional">
                  <Triggers>
                      <asp:AsyncPostBackTrigger ControlID="txtSearch" EventName="TextChanged" />
                  </Triggers>
                  <ContentTemplate>
                      <asp:TextBox ID="txtSearch" runat="server" EnableViewState="true" OnTextChanged="txtSearchBCode_TextChanged"></asp:TextBox>
                  </ContentTemplate>
              </asp:UpdatePanel>