Created Unassigned: add sql server compact 3.5 connection button disabled [11696]

Hi,

I downloaded SQL Server Compact Toolbox for runtime 3.5. I cannot connect to an existing database because the button is disabled.

When i execute SqlCe40Toolbox, there is no problem.

SQL Server CE 3.5 is installed with VS 2008.

How can i make it enabled and connect?