Feather mark on parts in assembly?

While building an assembly in SW 2009, a light blue feather mark appeared over the part in the feature manager tree, i didnt understand why!!!
What does it mean?

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2 Answers

Don't worry about it, it's a feature called lightweight components to improve performance when working with large assemblies.
You can turn it off by right clicking on the assembly in the feature tree and then click on Set Lightweight to Resolved.

 
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I did that but still the sketches and planes which i added before missing . :((

 
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