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AIS_LengthDimension Problem

Youko's picture

I'm trying to write a driver for my AIS_LengthDimension( ArgumentsList) with the ArgumentsList as attributes, so I Handled a new AIS_LengthDimension(ArgumentsList) wich can be converted to an AIS_InteractiveObject but I need his TopoDS_Shape for using it in TNaming_Builder.Generated( TopoDS_Shape). I tried to convert AIS_LengthDimension to AIS_InteractiveObject next to AIS_Shape and finally downcast it to TopoDS_Shape. the result is NullObject.
My Question is how to make conversion from Handle_AIS_LengthDimension to TopoDS_Shape or is there any method or other Classes that make Dimension manipulation possible from the viewer.

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