Ajax.NET UpdatePanelAnim ationExtender OnUpdating animation only fireing once

[Frinavale]

I have a peculiar problem with an UpdatePanelAnim ationExtender wherein the animation for the OnUpdating event only fires the first time the UpdatePanel it target's performs a PostBack.

The animation is quite simple...it disables all of the buttons in the UpdatePanel when it is updating...and enables all the buttons within the UpdatePanel once it finishes it's postback.

I am dynamically creating the animation in my VB.NET code:

Private Function GenerateUpdatedPanelAnimation() As String
        Dim str As New StringBuilder
 
        str.Append("<OnUpdating>" + vbLf)
 
        str.Append(DisableButtons)
        str.Append("</OnUpdating>" + vbLf)
 
        str.Append(" <OnUpdated>" + vbLf)
 
        str.Append(EnableButtons())
        str.Append("</OnUpdated>" + vbLf)
 
        Return str.ToString
 
    End Function
 Private Function EnableButtons() As String
        Dim str As New StringBuilder
        str.Append("    <Parallel>" + vbLf)
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MyFirstButton.ClientID + """ Enabled=""" + "false""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MySecondButton.ClientID + """ Enabled=""" + "false""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MyThridButton.ClientID + """ Enabled=""" + "false""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MyFourthButton.ClientID + """ Enabled=""" + "false""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_Refresh.ClientID + """ Enabled=""" + "false""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_Exit.ClientID + """ Enabled=""" + "false""" + " />")
 
        str.Append("      </Parallel>" + vbLf)
 
        Return str.ToString
    End Function
 
Private Function DisableButtons() As String
       Dim str As New StringBuilder
        str.Append("    <Parallel>" + vbLf)
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MyFirstButton.ClientID + """ Enabled=""" + "true""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MySecondButton.ClientID + """ Enabled=""" + "true""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MyThridButton.ClientID + """ Enabled=""" + "true""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_MyFourthButton.ClientID + """ Enabled=""" + "true""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_Refresh.ClientID + """ Enabled=""" + "true""" + " />")
        str.Append("       <EnableAction AnimationTarget=""" + BTN_Exit.ClientID + """ Enabled=""" + "true""" + " />")
        str.Append("      </Parallel>" + vbLf)
 
        Return str.ToString
    End Function

The animation will fire the first time the UpdatePanel updates. But will not fire again.

I'm quite baffled by this.

This same logic is used to all the disable buttons within a custom web user control and it fires ever time without fail. These web user controls are in the UpdatePanel with the buttons and their UpdatePanelAnim ationExtender animations fire properly every time.

I'm open to suggestions.

Thanks

-Frinny