Flex 4:The default property contents must be contiguous -

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Flex 4:The default property contents must be contiguous

In Flash Builder 4, when tried to create a MXML component and instantiate it in the main MXML application, I found that the "Outline" explorer is not displaying the correct tree view anymore, instead it displayed excalmatory marks for each of the components' icon:

And when I switched to the design view in the MXML editor, it failed to render the preview and showed an error message "The default property contents must be contiguous":

However, when I compiled and run the application, everything looked OK. I think this was just an error for the Flash Builder 4 failing to parse and render the outline and preview. The code which was generating such error looks like this:

Code - MXMLPlain Text

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:components="components.*">
<fx:Declarations>
</fx:Declarations>
<s:layout>
<s:VerticalLayout horizontalAlign="center" paddingTop="20"/>
</s:layout>
<s:TextInput id="sourceText" text="some value"/>
<s:Label text="{sourceText.text}"/>
<s:TextInput id="input1" text="@{input2.text}"/>
<s:TextInput id="input2"/>
<s:TextInput id="sourceText2" text="some value 2"/>
<s:Label id="destinationText"/>
<fx:Binding source="sourceText2.text" destination="destinationText.text"/>
<components:MyComponent id="comp1"/>
</s:Application>

As the error message said, the visual componets (default property contents) must be contiguous. So I tried to move the "fx:Binding" tag to just behind the "fx:Declaration" tag, then the error went away.

Code - XML/HTMLPlain Text

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:components="components.*">
<fx:Declarations>
</fx:Declarations>
<fx:Binding source="sourceText2.text" destination="destinationText.text"/>
<s:layout>
<s:VerticalLayout horizontalAlign="center" paddingTop="20"/>
</s:layout>
<s:TextInput id="sourceText" text="some value"/>
<s:Label text="{sourceText.text}"/>
<s:TextInput id="input1" text="@{input2.text}"/>
<s:TextInput id="input2"/>
<s:TextInput id="sourceText2" text="some value 2"/>
<s:Label id="destinationText"/>
<components:MyComponent id="comp1"/>
</s:Application>

Note that the "s:layout" from the spark library is also a non-visual component, so it can't be placed between any of the visual components neither, otherwise the same error would occur.