.NET step...compiling

[VBuild_Rookie]

I'm trying to compile a .NET solution file it works fine only issue I'm having is that it compiles every project in the solution every time. I want the solution to act as a build and not a rebuild.... I believe is doing a build but like I mentioned it does every project. I just run the compile .NET step then I run it again using the "test" button and I check the dll and they are changed have new timestamp. I also have the FORCE A BUILD OF ALL PROJECTS unchecked and have an override set to [Builder.LaunchType = vbldLaunchBuild].....but this is not helping.....I just want to be able to run the visual build pro script and only have the compile .NET step compile projects that have changed.....