testing to use iterator over shape file. class are not strategy now.
Change register method
including new exceptions
change priority of the 3D extension
refactoring to use new ViewPort3D
Bug solved. noth activation run correctly
Check projection when adding layers. Added dirty flag to viewport for locator control
ViewPort3D functionality to support Information tool
Do not update status bar as mouse moves
comment setColor method. Set the color using symbol
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