The presentation elements of an Insertable can be included in an ispec presentation by defining an instance of the Insertable as an attribute (templated to the Insertable) in the Ispec.
To indicate the presence of an Insertable a transparent panel is positioned on the topleftmost (0, 0) of the screen. A panel is placed on top of another panel when more than one Insertable GLG is inserted into the Ispec.