Hi, thanks for your suggestion, but, before posting here the question, I also tried that stuff. Now, could be that things work well using those functions, but I noticed that the graphical appearance of those checkboxes is worse than the standard one. Moreover mine here was a "possible bug report" more than a search of a solution. As a matter of fact the actual problem is the color of the "mark symbol". The fact must be investigated. Hopefully it is some bug in my code, otherwise you understand that changing the targetsdk, according to Erel's suggestions, till now, things went even worse, and this opens an unpleasant scenario where we cannot rely on emulator behavior. Anyway, as I said, very much probably it is some subtle error in my code... as usual.. Thanks again for your interest in my problem...