In this section the Tcl/Tk (scripted) customization of the look and feel of the data windows is shown. The layout of the properties drawn in the interior of any of the data windows - either Conditions, Materials, Interval Data or Problem Data - can be customized by a feature called TkWidget; moreover, the common behaviour of two specific data windows, Conditions and Materials, can be modified by a Tcl procedure provided for that purpose. This common behaviour includes, in the case of Materials for example, assigning/unassigning, drawing, geometry types, where to assign materials, creating/deleting materials, etc.