What is the problem in this code?[paint project for Collage]

Question

What is the problem in this code?
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I could write a paint program
but
Can not be Saved the shape Are created  by Class
And
when I draw a new shape,Previous Shapes are removed?
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Project file Link For Download:

http://msiamian.persiangig.com/Project/TestPaint2.rar

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please Help Me;