Hi,  
   	  
   	I want to add materials to different regions of the FEKO union geometry. When, I right click the region of interest and go to properties  only 2-3 medium available from the region medium drop down menu. Even, I add a medium by using the + sign, the medium only goes to media tree but can not select from the drop down menu. 
   	I did  not have this issue with simple non-union geometries. 
   	Please share if you know how to solve this problem. 
   	  
   	Thanks in advanced.