\param{bool}{ yBottomUp}}
Sets the x and y axis orientation (i.e., the direction from lowest to
-highest values on the axis). The default orientation is the natural
-orientation, e.g. x axis from left to right and y axis from bottom up.
+highest values on the axis). The default orientation is
+x axis from left to right and y axis from top down.
\wxheading{Parameters}