Associative hatches are linked to their boundaries, and update when their boundaries are modified. 
Non-associative hatches are independent of their boundaries. 
To set hatching to be associative, check Associative Hatch on the Display page of the Drawing Setup (Options / Display).To break the link between an associative hatch and its boundary, select both the boundary and the hatch, and select Dr op Link from the Inspector Bar or local menu. 
This manual serves as the User Guide for all TurboCAD LTE 8 / DoubleCAD 5 Products
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