Change targetSdkVersion problem

Hi, I modified the targetSdkVersion to 15 in an old project (before this change it was set to 4!).
But I see that after this change the background of EditText and Spinner objects is set to black.
Furthermore, I had also created a personal TabHost (with Panels and Buttons), in which each panel is partially over the buttons, but after the change of targetSdkVersion the BringToFront is not respected correctly.

How can I fix this? Thanks for support.

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