[Flex 4] Application not including Spark Components

Question

I'm building a module-based application where a main application SWF loads several Module SWFs to serve in the app. I have noticed a strange problem in loading the Modules. If I don't have a certain component (for example: spark.components.Panel) manually compiled into my application SWF, it will not compile in at all. I assumed that the entire Flex framework was automagically compiled into the main SWF (or in a RSL) by default.
Perhaps I've set things up wrong. I am building the project with Ant, so my tasks look like this:
<!-- compile the main application -->
<target name="compile.main" depends="flex.setup">
     <mxmlc file="${flex.src.dir}/application.mxml" incremental="true"
               output="${flex.main.file}" debug="true" link-report="${flex.linkreport.file}">
          <load-config filename="${FLEX_HOME}/frameworks/flex-config.xml"/>
          <load-config filename="conf/project-config.xml"/>
     </mxmlc>
</target>
<!-- compile modules -->
<target name="compile.modules" depends="flex.setup">
     <mxmlc file="${myApp.module.file}" load-externs="${flex.linkreport.file}"
               output="${forum.module.output.file}"
               incremental="true"
               debug="true">
          <load-config filename="${FLEX_HOME}/frameworks/flex-config.xml"/>
          <load-config filename="conf/project-config.xml"/>
     </mxmlc>
</target>
Both of those targets are of course pointing to a configuration file, which I have here:
<?xml version="1.0"?>
<flex-config>
     <target-player>10.0.0</target-player>
     <compiler>
          <source-path append="true">
               <path-element>../src</path-element>
          </source-path>
           <library-path append="true">
                <path-element>../lib/as3commons-lang-1.0.0.swc</path-element>
                <path-element>../lib/as3commons-logging-1.0.0.swc</path-element>
                <path-element>../lib/as3commons-reflect-1.0.0.swc</path-element>
                <path-element>../lib/as3corelib.swc</path-element>
                <path-element>../lib/flexunit-4.0.swc</path-element>
                <path-element>../lib/flexunit-lib-1.0.swc</path-element>
                <path-element>../lib/flexunit-uirunner-4.0.swc</path-element>
                <path-element>../lib/hamcrest-as3.swc</path-element>
                <path-element>../lib/monsterdebugger-2.0.4.swc</path-element>
                <path-element>../lib/spring-actionscript-core-0.8.swc</path-element>
                <path-element>../lib/swfaddress-2.3.swc</path-element>
           </library-path>
     </compiler>
</flex-config>
I am not having any problems or warnings in compiling the above code. Is there something I'm missing here? Do I have to manually embed the classes/swcs? I'm using Flex 4.0.0.7219.

Answer 1

How can I use the RSL? I already have this chunk in my {FLEX_HOME}/frameworks/flex-config.xml:
   <!-- runtime-shared-library-path: specifies a SWC or directory to link against and an RSL URL to load with optional failover URLs -->
   <!-- TextLayout SWC -->
   <runtime-shared-library-path>
      <path-element>libs/textLayout.swc</path-element>
      <rsl-url>http://fpdownload.adobe.com/pub/swz/flex/4.0.0.7219/textLayout_427.swz</rsl-url>
      <policy-file-url>http://fpdownload.adobe.com/pub/swz/crossdomain.xml</policy-file-url>
      <rsl-url>textLayout_427.swz</rsl-url>
      <policy-file-url></policy-file-url>
   </runtime-shared-library-path>
   <!-- Framework SWC -->
   <runtime-shared-library-path>
      <path-element>libs/framework.swc</path-element>
      <rsl-url>http://fpdownload.adobe.com/pub/swz/flex/4.0.0.7219/framework_4.0.0.7219.swz</rsl-url>
      <policy-file-url>http://fpdownload.adobe.com/pub/swz/crossdomain.xml</policy-file-url>
      <rsl-url>framework_4.0.0.7219.swz</rsl-url>
      <policy-file-url></policy-file-url>
   </runtime-shared-library-path>
   <!-- Framework_textLayout SWC -->
   <runtime-shared-library-path>
      <path-element>libs/framework_textLayout.swc</path-element>
      <rsl-url>http://fpdownload.adobe.com/pub/swz/flex/4.0.0.7219/framework_textLayout_4.0.0.7219.swz</rsl-url>
      <policy-file-url>http://fpdownload.adobe.com/pub/swz/crossdomain.xml</policy-file-url>
      <rsl-url>framework_textLayout_4.0.0.7219.swz</rsl-url>
      <policy-file-url></policy-file-url>
   </runtime-shared-library-path>
   <!-- Flex4 SWC-->
    <runtime-shared-library-path>
      <path-element>libs/flex4.swc</path-element>
      <rsl-url>http://fpdownload.adobe.com/pub/swz/flex/4.0.0.7219/flex4_4.0.0.7219.swz</rsl-url>
      <policy-file-url>http://fpdownload.adobe.com/pub/swz/crossdomain.xml</policy-file-url>
      <rsl-url>flex4_4.0.0.7219.swz</rsl-url>
      <policy-file-url></policy-file-url>
   </runtime-shared-library-path>
   <!-- RPC SWC -->
    <runtime-shared-library-path>
      <path-element>libs/rpc.swc</path-element>
      <rsl-url>http://fpdownload.adobe.com/pub/swz/flex/4.0.0.7219/rpc_4.0.0.7219.swz</rsl-url>
      <policy-file-url>http://fpdownload.adobe.com/pub/swz/crossdomain.xml</policy-file-url>
      <rsl-url>rpc_4.0.0.7219.swz</rsl-url>
      <policy-file-url></policy-file-url>
   </runtime-shared-library-path>
Since these are present and I'm still getting the error, what is going wrong? I assume that Flex is failing over to the Adobe hosted RSLs, but I don't know. Because I'm loading multiple flex-config files for my application, would that affect what I'm doing?