I would line to paint the background of the picker (and also the list but it seems that the list is only available on iOS?). If i paint it using:
<Item label="we" value="key0" />
<Item label="you" value="key1" />
<Item label="me" value="key2" />
<Item label="they" value="key3" />
<Item label="he" value="key4" />
the little arrow is also painted and desappear but its original color is black. How to solve this keeping it black or paint the little arrow with some color?