Problem with material not applying

Hi guys! I’m new to rhino and i have to model this house for a class. I am trying to make this one wall glass and each time I try to change the material it just stays as the default material and won’t become glass!! How can I fix this? Thanks in advance.

Hi Corinna -
From you screenshot, it appears that the window object is on layer “210 Decke”. It also appears that you have a “Glass” material applied to layers “Glass” and “Layer 02”. If the object’s settings are to use the layer material, changing the object to one of these layers should do the trick.

Thank you! That was a simple fix:)