+ /// is this inset based on the InsetArgument class?
+ virtual InsetArgument const * asInsetArgument() const { return nullptr; }
+ /// is this inset based on the InsetGraphics class?
+ virtual InsetGraphics * asInsetGraphics() { return 0; }
+ /// is this inset based on the InsetGraphics class?
+ virtual InsetGraphics const * asInsetGraphics() const { return 0; }