Show RadWindow on Page_Load

[urbanBaldGuy]

I have a RadWindow that I am launching, I want to show a second RadWindow automatically if the user has opted to use my wizard.

If I use a button to launch the second window it works fine, if I try to do it automatically on Page_Load I get the error 'undefined is null or not an object'.

Here is the code behind:

if (!IsPostBack && Profile.UseOrderWizard)
        {
            ClientScript.RegisterStartupScript(this.GetType(), "NewOrderWizard", "<script type='text/javascript'>ShowOrderWizard();</script>");
        }

Here is the javascript:

<script type="text/javascript">
        function ShowOrderWizard() {
            window.radopen("NewOrderWizard.aspx", "NewOrderWizard");
            return false;
        }
    </script>

Here is the RadWindow Object:

<telerik:RadWindowManager ID="rwmNewOrder" runat="server" Behaviors="Reload,Close" Skin="Vista" Modal="true"
    VisibleStatusbar="false" ReloadOnShow="true" ShowContentDuringLoad="false">
        <Windows>
            <telerik:RadWindow ID="NewOrderWizard" runat="server" Width="700" Height="460" />
        </Windows>
    </telerik:RadWindowManager>

[Sophy]

Hi Rob,

The error you receive when try to open a second window on Page_Load is most probably due to the RadWindow still has not been created. The order in which the client events are fired in the page life cycle is 
window.onload -> Sys.Application.init -> Sys.Application.load
The client object representation of the MS AJAX controls are created in the Sys.Application.init event, which is raised after the window.onload event. For that reason you can get a reference to the RadWindow no earlier that in the Sys.Application.load event, which is raised after all scripts have been loaded and the objects in the application have been created and initialized.
In your case you will need to replace 
<script type='text/javascript'>ShowOrderWizard();</script>
with
<script type='text/javascript'>Sys.Application.add_load(ShowOrderWizard);</script>
and the error should not appear.
If you need further assistance, do contact us again.

Best wishes,
Sophy
the Telerik team

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[urbanBaldGuy]

Thanks, that worked great!