How to disable auto fold?

Hi,

On my custom language, I finished fold code following this post: http://www.jetbrains.org/intellij/sdk/docs/tutorials/custom_language_support/folding_builder.html?search=fold

Everything is OK, except that every time I open the file, all custom code is folded by default. How can I disable it?

I check/uncheck Editor->General->Code Folding, but it does not work.