Createtoolwindow2 from vspackage

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plugin

tools

AddIn

VS2015

Can anyone please guide me how can I convert Add-Ins to VSPackage Extention without recreating/replicating everything into VSIX?

I have one addin which is supporting VS2010 to VS2013. I have everything in .sln. I want to migrate/create .addin into .vsix for compatibility issue of VS2015. After few research, I have found that the code what is written in IDTCommandTarget.Exec method has to run into my custom command class of vsix project...

What I have tried:

So, I created a new .vsix project in same solution & add a reference of my .addin project into .vsix project and I am able to load initial controls of my addin project as like below...

http://i.stack.imgur.com/PhdI3.png[^]

but as per the code, I want to create CreateToolWindow2 on double click of my tree node but I am getting following error (null AddInInstance)...

http://i.stack.imgur.com/zg74X.png[^]

Can anyone please guide me how can I create an Instance of AddIn class to create ToolWindow2?