Hi I am new with creating apps and thought to play a bit with a thought. I am looking for a tutorial or similar that explains how I can do the following: I want the two circles at the bottom of the screen, one blue and one red. When I select the blue circle and I'll be able to put out blue circles on the screen and when I select the red circle I'll be able to put out the red circles on the screen. The circles should therefore have specific dimensions. I have searched a lot but can not find anything similar. Someone who can give some tips?