There are certain timeless questions about MATLAB. I was just asked about this and knew I had made a video about changing object properties in GUIDE.
I have been making video for quite a while. There are 250+ of them. Look to the left and see the archives. I believe that you can get a first rate education in MATLAB by watching the 20 or more hours of video hosted here. Even if the video was made some eight years ago, most of the techniques should still work today. I tend to focus on the core parts of the language which do not change from release to release.