3. An executable software product stored on a non-transitory computer-readable medium containing program instructions for controlling a size and content of a hierarchical visualization of nodes including a collapsed sub-hierarchy, the program instructions for: displaying a multi-level hierarchical visualization of nodes, including a node representing a collapsed sub-hierarchy that is displayed using a collapsed sub-hierarchy symbol that is not applied to regular nodes; responsive to a user invoking a contextual search by performing a user gesture on the collapsed sub-hierarchy symbol displaying a contextual search dialog box located adjacent to the collapsed hierarchy symbol that displays a text entry field for the user to enter a search criteria that is contextual only to the collapsed sub-hierarchy, wherein the contextual search dialog further displays a total number wherein the contextual search dialog further displays a total number of hidden units comprising the collapsed sub-hierarchy; responsive to the user entering the criteria, displaying search results comprising any nodes from the collapsed sub-hierarchy matching the search criteria wherein the search results are displayed directly in the contextual search dialog box to control the size of the hierarchical visualization; receiving a user selection of which ones of the matching nodes from the collapsed sub-hierarchy to show in the hierarchical visualization: and displaying a partial rendering of the collapsed sub-hierarchy that shows the selected matching nodes while keeping remaining non-matching nodes hidden, wherein other nodes linked to the matching nodes representing a collapsed sub-hierarchy are displayed using the collapsed sub-hierarchy symbol that is not applied to regular nodes.
3. An executable software product stored on a non-transitory computer-readable medium containing program instructions for controlling a size and content of a hierarchical visualization of nodes including a collapsed sub-hierarchy, the program instructions for: displaying a multi-level hierarchical visualization of nodes, including a node representing a collapsed sub-hierarchy that is displayed using a collapsed sub-hierarchy symbol that is not applied to regular nodes; responsive to a user invoking a contextual search by performing a user gesture on the collapsed sub-hierarchy symbol displaying a contextual search dialog box located adjacent to the collapsed hierarchy symbol that displays a text entry field for the user to enter a search criteria that is contextual only to the collapsed sub-hierarchy, wherein the contextual search dialog further displays a total number wherein the contextual search dialog further displays a total number of hidden units comprising the collapsed sub-hierarchy; responsive to the user entering the criteria, displaying search results comprising any nodes from the collapsed sub-hierarchy matching the search criteria wherein the search results are displayed directly in the contextual search dialog box to control the size of the hierarchical visualization; receiving a user selection of which ones of the matching nodes from the collapsed sub-hierarchy to show in the hierarchical visualization: and displaying a partial rendering of the collapsed sub-hierarchy that shows the selected matching nodes while keeping remaining non-matching nodes hidden, wherein other nodes linked to the matching nodes representing a collapsed sub-hierarchy are displayed using the collapsed sub-hierarchy symbol that is not applied to regular nodes. 4. The executable software product of claim 3 , wherein the instructions for displaying any nodes from the collapsed sub-hierarchy matching the search criteria further comprises instructions for: performing a partial search of only the collapsed sub-hierarchy for hidden nodes containing the search criteria; and displaying in the contextual search dialog a subset of the nodes from the collapsed sub-hierarchy returned from the partial search that match the search criteria.