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The standard hierarchical navigator provides a clear visual distinction
between a block's contents and the block itself.
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Contents are represented by a plus "+" or minus "-" icon.
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The block itself is represented by a unique icon denoting its type.
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Clicking the contents button displays a block's contents in both
hierachical navigator and data flow diagrams.
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Clicking the properties button displays a block's properitess
in a seperate window(old idea!).
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