public static extern nk_colorf nk_color_picker(nk_context *ctx, nk_colorf color, nk_color_format cfmt);
public static extern int nk_color_pick(nk_context *ctx, nk_colorf *color, nk_color_format cfmt);
public static extern NkColor nk_color_picker(nk_context *ctx, NkColor color, nk_color_format cfmt);