Can't See the solutions fo the crm server in my crm explorer

Hello every one

I'm .net developer and i have a Dynamics CRM 2011 on premise version. When i Tried to create a visual studio 2010 crm solution with the sdk toolkit and i'm filling the crm server connection dialog, when i choose the Organization name, the drop down list of solutions stay blocked and i canot choose the solution wich i want to connect.

What i have to do to choose the solutions in the dropdown list?

My onpremise version is rollout 5.

Thanks a lot