[CMake] Problems with nightly builds

[NoRulez]

Hello,

i've a build server running based on http://www.cmake.org/Wiki/CTest:Buildserver.
The build slave is a Windows Server 2003 R2.

So, what I try to archive is the following:
Each time a developer check in files/changes, then the continuous build (every minute) starts to with the last changes found. => OK
But in the nightly build I want to run a clean build (As building the project for the first time). It seems that the nightly build is based on the last continuous build.
How can I avoid this behavior and/or change them?

Thanks in advance

Best Regards
NoRulez
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