Arbortext IsoDraw > User's Reference > Palette Window Toolbox > Elements > Rectangle > Converting the Element
  
Converting the Element
Choose Element > Convert > into elements to convert rectangles into individual lines. These lines are initially grouped together after being converted. You can edit the lines individually once they have been ungrouped by executing Element > Ungroup.
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A rectangle is automatically converted into lines or polylines if you delete individual sides.
You can use the Element > Convert > into Bézier parts command to convert a rectangle into a Bézier path.
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Once a rectangle has been converted into individual lines or a Bézier path, it is not possible to convert these back into the former rectangle.