I have a user control that uses ModalPopupExtender. Inside the user control, there are 2 buttons and a WebDataGrid. First column in the grid is an UnboundCheckBoxField.

When the popup comes up, displays the grid with data, I can use either of the buttons to hide the popup. The second that any row is checked (with checkboxes), the popup does not close on button clicks anymore. I have a server side event for the button "confirm" and it does not fire if a single row in the grid is checked. I noticed however that it's fine and still works if ALL or NO rows are checked. Clueless as to why that would be happening.

If a checkbox or multiple checkboxes are checked, the server side events for buttons do not fire anymore. If ALL checkboxes are checked or none, they fire fine.

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="EmployeeSelector.ascx.vb" Inherits="EmployeeSelector" %>

<%@ Register Assembly="Infragistics4.Web.v14.1, Version=14.1.20141.2392, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB" Namespace="Infragistics.Web.UI.GridControls" TagPrefix="ig" %>

<%@ Register Assembly="Infragistics4.WebUI.Misc.v14.1, Version=14.1.20141.2392, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB" Namespace="Infragistics.WebUI.Misc" TagPrefix="igmisc" %>

<style type="text/css">

    .modalBackground {

   background-color:#000000;

   filter:alpha(opacity=80);

   opacity:0.8;

   }

   .modalPopup

   {

   position:fixed;

   border-radius:5px;

   top:10%;

   left:10px;

   width:700px;

   height:400px;

   text-align:center;

   background-color:White;

   color:black;

   }

</style>

<ajax:ModalPopupExtender ID="popup" runat="server" DropShadow="false" PopupControlID="pnlPopup" TargetControlID="lnkFake" BackgroundCssClass="modalBackground"></ajax:ModalPopupExtender>

<asp:Panel ID="pnlPopup" runat="server" CssClass="modalPopup">

    <table>

        <tr>

            <td>

                <table>

                    <tr>

                        <td>

                            <asp:Button ID="btnClose" runat="server" CssClass="btn btn-xs btn-primary" OnClientClick="return Hidepopup()" Text="Close" />

                        </td>

                        <td>

                            <asp:Button ID="btnConfirm" runat="server" CssClass="btn btn-xs btn-primary" Text="Confirm" />

                        </td>

                    </tr>

                </table>

            </td>

        </tr>

        <tr>

            <td>

                <table style="width: 700px">

                    <tr>

                        <td style="width: 70%; height: 300px">

                            <ig:WebDataGrid ID="dgv" AutoGenerateColumns="false" HeaderCaptionCssClass="InfraGridHead_XS" EnableAjax="false" Height="100%" Width="100%" runat="server">

                                <Behaviors>

                                    <ig:Activation Enabled="true"></ig:Activation>

                                    <ig:EditingCore BatchUpdating="true">

                                        <Behaviors>

                                            <ig:CellEditing>

                                                <EditModeActions MouseClick="Single" EnableOnActive="true" />

                                                <ColumnSettings>

                                                    <ig:EditingColumnSetting ColumnKey="Code" ReadOnly="true" />

                                                    <ig:EditingColumnSetting ColumnKey="FullName" ReadOnly="true" />

                                                    <ig:EditingColumnSetting ColumnKey="SquadCode" ReadOnly="true" />

                                                    <ig:EditingColumnSetting ColumnKey="RankCode" ReadOnly="true" />

                                                </ColumnSettings>

                                            </ig:CellEditing>

                                        </Behaviors>

                                    </ig:EditingCore>

                                </Behaviors>

                            </ig:WebDataGrid>

                        </td>

                    </tr>

                </table>

            </td>

        </tr>

    </table>

</asp:Panel>

<asp:LinkButton ID="lnkFake" runat="server"></asp:LinkButton>

And here's the VB code:

Imports VCS.Database.Access.MSSQL

Partial Class EmployeeSelector

    Inherits System.Web.UI.UserControl

    Public Event Confirm()

    Private Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load

        If Not IsPostBack Then

            configGrid()

        End If

        LoadEmployees()

    End Sub

    Private Sub LoadEmployees()

        Dim emps = EmployeeDao.LoadAllEmployees.OrderBy(Function(x) x.LastName).ToList

        dgv.DataSource = emps

        dgv.DataBind()

    End Sub

    Public Sub Show()

        popup.Show()

    End Sub

    Protected Sub btnConfirm_Click(sender As Object, e As EventArgs) Handles btnConfirm.Click

        RaiseEvent Confirm()

    End Sub

    Private Sub configGrid()

        dgv.AutoGenerateColumns = False

        Dim chk As New Infragistics.Web.UI.GridControls.UnboundCheckBoxField

        chk.Key = "Checked"

        chk.Header.Text = ""

        chk.Hidden = False

        chk.Width = 30

        dgv.Columns.Add(chk)

        Dim col As New Infragistics.Web.UI.GridControls.BoundDataField

        col = New Infragistics.Web.UI.GridControls.BoundDataField

        col.DataFieldName = "Code"

        col.Key = "Code"

        col.Header.Text = "Code"

        col.Hidden = False

        dgv.Columns.Add(col)

        col = New Infragistics.Web.UI.GridControls.BoundDataField

        col.DataFieldName = "FullName"

        col.Key = "FullName"

        col.Header.Text = "Name"

        col.Hidden = False

        dgv.Columns.Add(col)

        col = New Infragistics.Web.UI.GridControls.BoundDataField

        col.DataFieldName = "RankCode"

        col.Key = "RankCode"

        col.Header.Text = "Title"

        col.Hidden = False

        dgv.Columns.Add(col)

        col = New Infragistics.Web.UI.GridControls.BoundDataField

        col.DataFieldName = "SquadCode"

        col.Key = "SquadCode"

        col.Header.Text = "Group"

        col.Hidden = False

        dgv.Columns.Add(col)

    End Sub

End Class