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creo4 config.pro option documentation for: ENABLE_SHADED_VIEW_IN_DRAWINGS            

enable_shaded_view_in_drawings

Enables the display of shaded views in drawings when the environment setting is Shading or when the view display style is set to Shading. If this configuration option is set to no , views are displayed in wireframe and the Shading option in the Display Style list in the Drawing View properties dialog box is not available for selection.
Default and Available Settings:
yes* - Shaded views are allowed in the drawing.
no - View display is in wireframe.
 
* If you set the enable_shaded_view_in_drawing configuration option to no and the model_display_for_new_views Detail option to shading , then the actual display of the drawing view is in wireframe.