Change Background Color of the Preloader Phase

To accomplish change the default background of the Flash application during the preloader phase the HTML code needs to be changed.  This can be done through two methods.  The first method is to use the -default-background-color argument of mxmlc. 

In Flex Builder:

1. Open/Create Flex Project
2. Select Project > Properties > Flex Compiler
3. Add -default-background-color #336699 to the "Additional compiler arguments:"

The second method is to manually set the bgcolor of the embed object tag in the HTML wrapper of the Flex application.  For example

      <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
            id="test" width="100" height="100"
            codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab">
            <param name="movie" value="test.swf" />
            <param name="quality" value="high" />
            <param name="bgcolor" value="#336699" />
            <param name="allowScriptAccess" value="sameDomain" />
            <embed src="test.swf" quality="high" bgcolor="#336699"
                width="100" height="100" name="test" align="middle"
                play="true"
                loop="false"
                quality="high"
                allowScriptAccess="sameDomain"
                type="application/x-shockwave-flash"
                pluginspage="http://www.adobe.com/go/getflashplayer">
            </embed>
    </object>