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mxml:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/09/30/using-a-flex-textarea-control-as-a-drop-in-item-editor/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:XML id="itemsXML" source="data/items.xml" />

    <mx:DataGrid id="dataGrid"
            dataProvider="{itemsXML.item}"
            variableRowHeight="true"
            editable="true"
            width="100%"
            height="100%">
        <mx:columns>
            <mx:DataGridColumn id="idColumn"
                    dataField="@id"
                    editable="false"
                    headerText="ID" />
            <mx:DataGridColumn id="descColumnTextInput"
                    dataField="@desc"
                    editable="true"
                    wordWrap="true"
                    headerText="Desc (TextInput)" />
            <mx:DataGridColumn id="descColumnTextArea"
                    dataField="@desc"
                    editable="true"
                    wordWrap="true"
                    itemEditor="mx.controls.TextArea"
                    editorUsesEnterKey="true"
                    headerText="Desc (TextArea)" />
        </mx:columns>
    </mx:DataGrid>

</mx:Application>

items.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/09/30/using-a-flex-textarea-control-as-a-drop-in-item-editor/ -->
<items>
    <item id="1" desc="The quick brown fox jumped over the lazy dog." />
    <item id="2" desc="Lorem ipsum dolor sit amet, consectetuer adipiscing elit." />
    <item id="3" desc="Pellentesque nonummy aliquet metus." />
    <item id="4" desc="Nullam enim." />
    <item id="5" desc="Nullam sollicitudin sodales diam." />
    <item id="6" desc="Praesent quis tellus vel erat tristique placerat." />
    <item id="7" desc="Sed egestas, enim a convallis auctor, nisl tellus tincidunt nibh, vitae tempus mauris risus at arcu." />
    <item id="8" desc="Suspendisse laoreet sem eget ipsum porta consequat." />
    <item id="9" desc="Ut imperdiet felis quis orci." />
    <item id="10" desc="Phasellus tempus ante eu nisl." />
    <item id="11" desc="Donec velit sem, rutrum ac, bibendum sed, mattis ac, odio." />
    <item id="12" desc="Fusce mauris turpis, vehicula nec, mattis et, dapibus quis, arcu." />
    <item id="13" desc="Morbi tincidunt volutpat justo." />
    <item id="14" desc="Nam urna." />
    <item id="15" desc="Mauris est dui, aliquet at, venenatis tempus, eleifend a, pede." />
    <item id="16" desc="Vestibulum porttitor arcu sit amet nulla." />
    <item id="17" desc="Nulla vitae sapien." />
</items>

Original link

Client.Error.DeliveryInDoubt
Channel disconnected before an acknowledgement was received

If you are annoying and trickiest error to debug when you are using Flash Remoting through AMFPHP.

But this error is actually pretty simple. It simply means there is a syntax error in your PHP code or the SQL statement within your PHP code.

To solve this problem make sure that:

• Your Adobe Flex function parameters and PHP function parameters are of the same number.
• The parameters of your Adobe Flex function are in the same order with its PHP function counterpart.
• All the Adobe Flex function parameters are of the same data type with their PHP function parameters counterpart.
• You assign a default value to the optional parameters in the PHP function.
• You pass a value to the parameters that are not optional.
• Finally, your SQL statements should be syntactically correct.

Here a few of useful tools, framework and library  for a fast build of rich internet application with Flex:

Tools

- Flex Builder (Plugin): Adobe® Flex™ Builder™ 2 is an Eclipse™ based IDE for developing rich Internet applications (RIAs) with the Adobe Flex framework.
- Eclipse: an open source community whose projects are focused on building an open development platform
- Ant: a Java-based build tool. In theory, it is kind of like Make, but without Make’s wrinkles.
- Flex Ant Tasks: provide a convenient way to build your Flex projects using an industry-standard build management tool.
- ASDoc: a command-line tool that you can use to create API language reference documentation as HTML pages from the classes in your Flex application.
- Cruise Control: a framework for a continuous build process. It includes, but
is not limited to, plugins for email notification, Ant, and various source control tools.

Frameworks

- Cairngorm: a lightweight yet prescriptive framework for rich Internet application (RIA) development.
- PureMVC: a lightweight framework for creating applications in ActionScript 3, based upon the classic Model-View-Controller design meta-pattern
- Prana: an Inversion of Control (IoC) Container for the Flex Framework

Unit Testing

- FlexUnit: a unit testing framework for Flex and ActionScript 3.0 applications. It mimics the functionality of JUnit, a Java unit testing framework, and comes with a graphical test runner.
- Flex Unit Optional Ant Task: Allows you to hook FlexUnit into a Cruise Control cycle and extract test reports

Libraries

- Corelib: consists of several basic utilities for MD5 hashing, JSON serialization, advanced string and date parsing, and more.
- Flexlib: a community effort to create open source user interface components for Adobe Flex 2

Remote Gateways

- WebORB: facilitates connectivity between rich clients created with Flex, Flash or AJAX and server-side applications developed with .NET, Java, Ruby on Rails, PHP or XML Web Services.

- Fluorine: an open source .NET Flash Remoting Gateway.

- AMFPHP: a free open-source PHP implementation of the Action Message Format(AMF). AMF allows for binary serialization of Action Script (AS2, AS3) native types and objects to be sent to server side services.

- BlazeDS: is the server-based Java remoting and web messaging technology that enables developers to easily connect to back-end distributed data and push data in real-time to Adobe® Flex® and Adobe AIR™ applications for more responsive rich Internet application (RIA) experiences.

http://www.jamesward.com/census/