Thanks for the reply
You can set the height in Shadow4 skin from Options->Skins->Advanced->Shadow4 - Event List->Settings->Eventlist height (and the same for the todo list).
Allready done that, but that only forces a maximum height, not a constant height.
Allthough this is not what I'm actually looking for.
What I'm looking for is an option to tell the event and/or to do windows to grow upwards instead of downwards, so that the calender stays in it's original position.
You can also use the Sidebar window from Shadow4 which has the calendar, the event list and the todo list all in the same window.
The siderbar is cool, but I prefer to have the calendar at the bottom of the screen not the top !