Allow to create polygons with points when you did not select a polygon on the list
Allow to change position by points when polygon selected in list.

If the new cords are bad the polygon will not be changed.
When resize by points check is polygone is good else display error.
Allow to resize quelconque polygon. Retrive color for polygones during resize.
Clear text description when unselected polygon.
Clear text and points textbox when delete an element
Enablea last element selected in the list after a disabled element.
Create javadoc, remove useless code comments
Generate new javadoc, correct javadoc problems
Check if it is the left click of the mouse for mouse pressed and released