Draw background which may have two borders.

You can find more information in comments below.

bool Background2( // Draw background with 2 borders(inner and outer)(may have outer borders, inner borders, background color, background gradient) 
        IRenderer *renderer, // Renderer 
        const RectF &rect, // Block rectangle in control's coordinates 
        const RectF &outer_borders, // Block outer border widthes 
        const RectF &inner_borders, // Block inner border widthes 
        const RectF &radiuses, // Block border radiuses 
        const RectC &outer_border_colors, // Block outer border colors 
        const RectC &inner_border_colors, // Block inner border colors 
        const Color &background_color, // Background color 
        Gradient &background_gradient); // Background gradient