Flex 4 migration: how to resolve css warnings

Question

Hi,
we are trying to migrate a our flex app to flex 4, and while compiling the app, we are seeing a lot of the following warnings. I was wondering how to resolve these warnings. We are not using flex 3 compatibility flag but are using Halo as the default theme via the compiler argument -theme=${flexlib}/themes/Halo/halo.swc.
It seems that the warnings are coming from css packaged in datavisualization.swc and halo.swc
Thanks in advance
     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(22): Warning: Cannot resolve namespace qualified type 'AdvancedDataGrid' in
CSS selector 'AdvancedDataGrid'
     [java]
     [java]
     [java]
     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(56): Warning: Cannot resolve namespace qualified type 'AdvancedDataGridItem
Renderer' in CSS selector 'AdvancedDataGridItemRenderer'
     [java]
     [java]
     [java]
     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(66): Warning: Cannot resolve namespace qualified type 'AdvancedDataGridSort
ItemRenderer' in CSS selector 'AdvancedDataGridSortItemRenderer'
     [java]
     [java]
     [java]
     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(83): Warning: Cannot resolve namespace qualified type 'AdvancedDataGridHead
erRenderer' in CSS selector 'AdvancedDataGridHeaderRenderer'
     [java]
     [java]
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     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(115): Warning: Cannot resolve namespace qualified type 'AdvancedListBase' i
n CSS selector 'AdvancedListBase'
     [java]
     [java]
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     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(131): Warning: Cannot resolve namespace qualified type 'LegendItem' in CSS
selector 'LegendItem'
     [java]
     [java]
     [java]
     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(144): Warning: Cannot resolve namespace qualified type 'PrintAdvancedDataGr
id' in CSS selector 'PrintAdvancedDataGrid'
     [java]
     [java]
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     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\libs\datavisualization.swc$defaults.css(164): Warning: Cannot resolve namespace qualified type 'PrintOLAPDataGrid'
in CSS selector 'PrintOLAPDataGrid'
     [java]
     [java]
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     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\themes\Halo\halo.swc$defaults.css(911): Warning: Cannot resolve namespace qualified type 'HTML' in CSS selector 'HT
ML'
     [java]
     [java]
     [java]
     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\themes\Halo\halo.swc$defaults.css(1797): Warning: Cannot resolve namespace qualified type 'Window' in CSS selector
'Window'
     [java]
     [java]
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     [java] C:\svn-work\flex4p3\ui\lib\flex\frameworks\themes\Halo\halo.swc$defaults.css(1808): Warning: Cannot resolve namespace qualified type 'WindowedApplication' in
CSS selector 'WindowedApplication'

Answer 1

I just saw that we are using xmlns:mx="http://www.adobe.com/2006/mxml" in all our custom components written in mxml, including our main application.
In our custom css, I have the default namespace set to:
@namespace "library://ns.adobe.com/flex/mx";
could this result in these warnings ?