I have this app. I have a default white canvas where i'm abble to draw something that is always temporary. If the I decide that I want to keep what I've done I must click 'keep' and it creates a tab with my drawing. I would like to see some examples of how to tell the user that what is being drawn is always temporary till he asks the app to save it.
Do you know any examples os temporary sheets? (I tried overlays and dropshadows but I want to see other ways of making my message clear).