asp.net IScriptControl $create order

Question

I have two script controls (code is very simplified):

class Form : IScriptControl
{
      Panel pnl;
      Button trigger;
      public Form()
      {
           pnl = new Panel();
           trigger = new Button();

           IPresenter p = new Popup();
           p.SetContent(this.pnl);           
           this.Controls.Add(trigger);
      }
}

class Popup : IScriptControl, IPresenter
{
      public void SetContent(Control content)
      {
           this.Controls.Add(content);
      }
}

Now in the HTML output, i see the following (again very simplified):

<div id="ctrlForm">
    <div id="ctrlPopup">
        <div id="ctrlFormPnl"></div>
    </div>
    <div id="ctrlFormTrigger"></div>
</div>

And script:

Sys.Application.add_init(function() {
    $create(Form, {"_presenter":"FormPresenter"}, null, null, $get("ctrlForm"));
});
Sys.Application.add_init(function() {
    $create(Popup, {"_isOpen":false}, null, null, $get("ctrlPopup"));
});

Question: How I can do, that the script that creates the popup appears on page before script of form...in other words, when initializer of the ctrlForm control executes, I want to get reference to forms presenter.

I hope I clearly explained what I want to do. Thanks.

Eddy Shterenberg · Accepted Answer · 2012-10-31 23:29:23Z

In order to archive you goal you should let the child controls to register with ScriptManager before your control.

This can be done if you register your control with ScriptManager inside overridden Render method, after calling base.Render(...) like that:

    protected override void Render(HtmlTextWriter writer)
    {
        // Let child controls to register with ScriptManager
        base.Render(writer);

        // Now, when all the nested controls have been registered with ScriptManager
        // We register our control.
        // This way $create statement for this control will be rendered
        // AFTER the child controls' $create 
        if (this.DesignMode == false)
        {
            ScriptManager sm = ScriptManager.GetCurrent(this.Page);
            if (sm != null)
                sm.RegisterScriptDescriptors(this);
        }

   }

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