Feature 924 Add option to draw lines between polygons to visualize some
relationship
Curve Line
Display value in the middle of the line
Remove the option of drawing curve line
Add the option of displaying value in the middle of the line
fixed compile error
registering editor
verify function now checks for valid xml
fixed null pointer error
removed width/height constraints
better trace message
now using ControlPanel.openEditor() in more places.
commented out button