VSIX was disabled in Visual Studio by default

Hi Everyone,

I have created a VSIX file using Visual Studio 2012, which supports install in VS 2012 and VS 2013. Created VSIX file is installed successfully. 
But in VS 2013 it is not enabled by default. We need to enable it by using Tools->Extension and Update in Visual Studio IDE.
Is this a behaviour?

Regards,
Muthusamy P.