QuerySaveFile method

Hi All,

I am developing VS package. While debugging my code , what i found is 

while saving .chtml file , QuerySaveFile([InAttribute] string pszMkDocument, [InAttribute] uint rgf, [InAttribute] VSQEQS_FILE_ATTRIBUTE_DATA[] pFileInfo, out uint pdwQSResult) is suppposed to be called, but QuerySaveFiles([InAttribute] string pszMkDocument, [InAttribute] uint rgf, [InAttribute] VSQEQS_FILE_ATTRIBUTE_DATA[] pFileInfo, out uint pdwQSResult) is getting called , after that QuerySaveFile([InAttribute] string pszMkDocument, [InAttribute] uint rgf, [InAttribute] VSQEQS_FILE_ATTRIBUTE_DATA[] pFileInfo, out uint pdwQSResult) is getting callled. This introduced some different behaviour in my vs package. My visual studio version is VS 2010. 

Could anybody tell me , why this is happening ? please let me know if you need any other detals.

Note: I am pressing save button not save all