(I am using all the latest updates - completely removed everything I had and downloaded fresh stuff on November 7th) 

If I try an make any changes to a control that is contained inside an Accordion Pane on execution of Page_Load I get the following error:

Object reference not set to an instance of an object.

The controls inside the Accordion Pane are fine if I don't do anything with them at Page_Load - Any events after this (such as button clicks, index changes etc) work fine.

To simplify things I have modified the Accordion sample that comes as part of the sample web site

To the first Accordion Pane I have added just a text box:

     <ajaxToolkit:AccordionPane ID="AccordionPane1" runat="server">

And Page_Load is modified thus:

     protected void Page_Load(object sender, EventArgs e)

     {

     TextBox1.Text = "test";

     }

If I was to comment this Page_Load bit, the Accordion works fine and the text box appears OK:

If someone can confirm that this is a bug in the Accordion, then I can work around for the time being (I won't initialise at Page_Load), I will continue development and resolve in a later release.

Alternatively, if this is for some reason by design, then I'll need to reconsider the way I am using the page and what controls I use as I ultimately need this at page load - but I am sure it is a bug as the control is on the page and should be visible to the Page Load event

Thanks for lookin!

Further to my first post, I did come up with a workaround - I added an asp:Timer control:

 <asp:Timer id="timer_runOnce" runat="server" Interval="1" OnTick="timer_runOnce_Tick" />

And then in my C# code added a function thus:

protected void timer_runOnce_Tick( object sender, EventArgs e )

{

TextBox1.Text = "test";

timer_runOnce.Enabled = false;

}

Note: I found this worked in my own code but not so well in the accordion example - it kept repeating - I think it had something to do with the interval and also UpdatePanels - I was using it in an UpdatePanel in my code and it worked OK. Increasing the interval helped in the Sample Accordion script.

Hi,

had the same issue and found a working workaround. The problem is thet the controls inside the accordion are not instantiated yet in the Page_Load. So I tried to find a way to have them instantiated.

I found that if I look for a control in one of the panes, all the controls are instantiated at that time.

So foreach accordionpane that has controls on it find a control using the FindControl method. In my case I searched for a Label and set the text of the control to a dummy 'dash' value.

((Label)AccordionPane1.FindControl("lblLastName")).Text = "-";

((Label)AccordionPane2.FindControl("lblDomain")).Text = "-";

((Label)AccordionPane3.FindControl("lblServer")).Text = "-";

Once you searched for one control the way I did above, all the other controls are also instantiated and you can continue to set their values as before like

lblFirstName.Text = "Dirk"; 

Best regards,

Dirk

Thanks Dirk,

I tried that and it works a treat for me too - very clever - and neater than my timer solution

Cheers

Jed

An alternative way to do it is to add your initilzation code to the rest of AJAX's initialization code using the method Sys.Appication.add_init().

When your code is executed it will be assured that the accordion conrol is loaded and initialized.

I put the following code inline within my page and it worked fine.

I found another solution here .. http://couldbedone.blogspot.com/2007/07/what-wrong-with-accordion-control.html

It is very elegant and simple.

Basically, add Accordion1.FindControl("nothing") to the page_init ... controls are then accessible. Details in link.