Physics object goes through solid?

Hey everyone,

I'm making a platform game where when you click on the layout a object spawns on your mouse's position, the objects have physics, this means that if a person spawns a object in the sky that it would fall down to the floor, but I've encountered a problem,the object goes through the floor(solid), is there anyway I can fix this? I've tried making the object both a physic and a platform object but that makes the object really glitchy. Any help?

Thanks

Physical Object ONLY react with other physicals. So if you want a "solid" floor, this object has to inherit the physical behaviour and then you should set it to "inmovable"

AND Platform-Behaviour and Physical-Behaviour don't like each other that much <img src="smileys/smiley18.gif" border="0" align="middle" />

Also for references: Physics basics and Physics advanced are what you need when using the physic behavior in C2.