I am brand new to Blender, and I am working on a compositing and matchmoving tutorial. I have added some motion trackers to a video clip, added a small plane that I want to add particles to. However, the window on the right side of the interface that contains object properties and materials has vanished, and I cannot get it to reappear. I am pretty sure I did something to make it go away, and cannot for the life of me get it back. Can anyone help? I have attached a screenshot. I am running a new iMac, OS 10.8.2 with 32 GB of RAM. I also am using the latest version of Blender, 2.66.