The GM_AreaStyle_t type exposes the following members.
color to use for border pen
Border pen style (i.e. solid, dash, etc.)
Width to draw border pen in
color of brush to fill area with (when applicable to brush style). The color is defined as ARGB where the upper 8 bits are alpha. The exception is a value of 0 in the A is treated as no alpha.
Style of brush to fill area with
Render the label for this line if there is one
Render the label for this line even if it collides with another display label
Font to use to render label