A method and apparatus for applying a resolution policy for direct manipulation of nested graphical elements. This policy resolves the allowance or disallowance of dragging and dropping of a guest graphical element onto a host graphical element. This is particularly useful when applied to hierarchically...http://www.google.co.uk/patents/US6441835?utm_source=gb-gplus-sharePatent US6441835 - Resolution policy for direct manipulation on hierarchically structured visuals
