Visual Studio Development > Visual Studio Integrate

I created a basic VSPackage and it is displayed in Tool Menu Option of experimental instance of VS. 

Question 1: Once experimental instance of VS opened custom VSPackage should be disabled if user opens any solution file then only it should enable. example : File (Menu)--- Close Solution (SubMenu)

Question 2: After open any solution file, then custom Package inside Tool Menu is clicked i want to show that particular solution file path in alert. 

Any tips on these questions are very helpful.

Thanks in advance,

SABARINATHAN.T