set_position
Description:
Sets the position of the divider between the two panes.
Parameters:
| this | a `GtkPaned` widget | 
| position | pixel position of divider, a negative value means that the position is unset | 
Sets the position of the divider between the two panes.
| this | a `GtkPaned` widget | 
| position | pixel position of divider, a negative value means that the position is unset |