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I have 3 User Controls...
1) Grandpa Control: Has web controls and a Panel control that has a
Daddy Control in it.
2) Daddy Control: Has a textbox, a couple of buttons and an empty Panel
control.
3) Grandson Control: Has a couple of labels and one button (Delete).

On Page_Load, Granpda Control loads properly and all events are handled
fine. Daddy Control is also loaded and all events are handled fine. In
the empty Panel on the Daddy Control, several instances of the Grandson
Control are added through code (LoadControl). Everything appears to be
fine.

I click the Delete button on Grandson Control #1, the event is handled
and Grandson #1 is deleted. At the end of the Delete Grandson
procedure, I bubble an event up to the Daddy Control signalling it to
empty the Panel of all controls, and re-add the Grandson Controls.
Everything looks fine, all of the Grandson Controls show up except the
recently deleted Grandson Control.

Here is the problem. If I click the Delete button on Grandson Control
#2, the page posts back and all Page_Load procedures are executed...
but the event which handles the Delete button click is not handled.
After the PostBack completes, Grandson #2 is still in the Panel on the
Daddy Control and still in the database.

If I click the delete button again for Grandson #2, the Delete button
click event is fired as expected.

So, 3rd generation control events are handled on every other click.
Why? I've run into this problem before in a much more complicated
scenario. I never got it to work and so I redesigned everything to have
only 2 generations of user controls and every thing worked fine. Please
help!

Thanks!

-E

Gaurav,

I've pasted the appropriate code and HTML below. To answer your
question, yes the Grandson control is a custom control made up of
standard Web controls. I think I'm handling the bubble events properly.
I built a custom eventargs class with custom parameters. If the
OnBubbleEvent catches an event with my custom class, it checks the
custom parameters to see if that particular control should handle it.
If the control should not handle the event, it passes it on up. If the
eventargs are not my custom type, it passes it up. If the event is
handled, the function returns true and the event does not bubble up
further. If this is not correct, please let me know.

Here is the code & HTML. Obviously, watch for line wrap:

Grandpa Control: ViewPhotoGallery.ascx

<%@ Control Language="vb"
Inherits="ViewPhotoGallery"CodeFile="ViewPhotoGall ery.ascx.vb"
AutoEventWireup="false" Explicit="True" %>
<%@ Reference
Control="~/DesktopModules/PhotoAlbum/PhotoGalleryCommentViewer.ascx" %>
<asp:Label ID="lblPhotoTitle" runat="server"></asp:Label>
<asp:Label ID="lblPhotoCaption" runat="server"></asp:Label>
<aspanel ID="pnlTitleComments" runat="server">
<uc1hotoGalleryCommentViewer ID="PhotoGalleryCommentViewer1"
runat="server" />
</aspanel>

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Page.MaintainScrollPositionOnPostBack = True
GenerateAlbumPreviews()
End Sub

Sub GenerateAlbumPreviews()
PhotoGalleryCommentViewer1._IsEditable = IsEditable
PhotoGalleryCommentViewer1._PhotoID = CPhoto.ItemID
End Sub


Daddy Control: PhotoGalleryCommentViewer.ascx

<%@ Control Language="VB" AutoEventWireup="false"
CodeFile="PhotoGalleryCommentViewer.ascx.vb"
Inherits="PhotoGalleryCommentViewer" %>
<%@ Reference
Control="~/DesktopModules/PhotoAlbum/PhotoGalleryCommentItem.ascx" %>
<asp:TextBox ID="txtComment" runat="server" Height="70px"
TextMode="MultiLine" Width="150px"></asp:TextBox>
<asp:TextBox ID="txtAuthor" runat="server" Width="150px"></asp:TextBox>
<asp:LinkButton ID="lbClear" CssClass="CommandButton"
runat="server">Clear</asp:LinkButton>
<asp:LinkButton ID="lbSubmit" CssClass="CommandButton"
runat="server">Submit</asp:LinkButton>
<aspanel ID="pnlComments" runat="server" Width="150px">
</aspanel>

Public _PhotoID As Integer
Public _IsEditable As Boolean

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles
MyBase.Load
GetComments()
End Sub

Sub GetComments()
pnlComments.Controls.Clear()
Dim CComment As New CommentInfo
Dim Comments As List(Of CommentInfo)
Comments = PGController.GalleryPhotoCommentByPhotoID_qry(_Pho toID)
CRow = New TableRow
CCell = New TableCell
Dim CommentItem As PhotoGalleryCommentItem
For Each CComment In Comments
CommentItem = LoadControl("PhotoGalleryCommentItem.ascx")
CommentItem._ItemID = CComment.ItemID
CommentItem._CommentAuthor = CComment.Author
CommentItem._CommentDate = CComment.PostDate
CommentItem._CommentText = CComment.Comment
CommentItem._IsEditable = _IsEditable
CRow.Cells.Add(CCell)
CTable.Rows.Add(CRow)
Next
pnlComments.Controls.Add(CTable)
CTable = Nothing
CRow = Nothing
CCell = Nothing
CommentItem = Nothing
PGController = Nothing
CComment = Nothing
End Sub

Protected Overrides Function OnBubbleEvent(ByVal source As Object,
ByVal args As System.EventArgs) As Boolean
If args.GetType.Equals(GetType(PhotoGalleryEventArgs) ) Then
'This is a PhotoGallery specific event capture it and process or pass
it up the food chain
Dim PGArgs As PhotoGalleryEventArgs = CType(args,
PhotoGalleryEventArgs)
Select Case PGArgs.Action.ToUpper
Case "REDRAWCOMMENTS"
GetComments()
'Swallow this event
Return True
Case Else
'This is not an event for this procedure pass it on up the food chain
Return False
End Select
Else
'This is not an event for this code. Pass it on up the food chain
Return False
End If
End Function




Grandson Control: PhotoGalleryCommentItem.ascx

<%@ Control Language="VB" AutoEventWireup="false"
CodeFile="PhotoGalleryCommentItem.ascx.vb"
Inherits="PhotoGalleryCommentItem" %>
<asp:Label ID="lblComment" runat="server"></asp:Label>
<asp:Label ID="lblCommentDetails" runat="server"></asp:Label>
<asp:ImageButton ID="ibDeleteComment" runat="server"
ImageUrl="~/images/delete.gif"/>

Public _ItemID As Integer
Public _CommentText As String
Public _CommentDate As Date
Public _CommentAuthor As String
Public _IsEditable As Boolean

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles
MyBase.Load
lblComment.Text = _CommentText
lblCommentDetails.Text = _CommentAuthor & "<br />" & _CommentDate
ibDeleteComment.Visible = _IsEditable
End Sub


'THIS PROC IS EXECUTED ON THE 1ST, 3RD, 5TH, CLICK, BUT NEVER THE 2ND,
4TH, 6TH, ETC.
Protected Sub ibDeleteComment_Click(ByVal sender As Object, ByVal e As
System.Web.UI.ImageClickEventArgs) Handles ibDeleteComment.Click
Dim PGController As New PhotoGalleryController
If PGController.GalleryPhotoComment_del(_ItemID) > 0 Then
Dim PGEventArgs As New PhotoGalleryEventArgs("RedrawComments", "", "")
RaiseBubbleEvent(Me, PGEventArgs)
Else
Response.Write("<script language='javascript'>alert('An error occured.
The comment was not deleted. Please try again.');</script>")
End If
End Sub