Draws a flat box on cr with the given parameters.
Use gtk_render_frame and gtk_render_background instead
| style |
a Style |
| state_type |
a state |
| shadow_type |
the type of shadow to draw |
| widget |
the widget |
| detail |
a style detail |
| x |
x origin of the box |
| y |
y origin of the box |
| width |
the width of the box |
| height |
the height of the box |
| cr |
a Context |