ResourceDictionary value out of range in silverlight 3 RTW

I am porting my SL 3 beta code to RTW.
After a bit of tweaks, i got past build errors. Refer to other post. And then started getting the following runtime error:

Attribute "MyAssembly;component/MyStyles.xaml" value is out of range. [Line: x Position: y]

The corresponding line in the XAML below. Position y is the equal sign after TargetType.

• style key="ImageButton" targettype="Button"

The following is the code for MergedDictionaries reference

• resourcedictionary source="MyAssembly;component/MyStyles.xaml"

The actual cause was the Build Action property of XAML file.
The solution steps are
1) the xaml file you are referencing should have BuildAction = Resource
2) addition of a "/" prefix to the assembly in the source:

You can read more in these links:
http://silverlight.net/forums/t/111475.aspx

http://silverlight.net/forums/p/108647/251577.aspx#251577

Also, check the section
"3.18 Effects Files (.ps) can no longer be loaded as Content"
from the list of SL3 RTW breaking changes @ http://msdn.microsoft.com/en-us/library/cc645049(VS.95).aspx