Isolation polygons for SW Gas benchmark

I worked with with Robert today to create the SW Gas Isolation polygon tool.  At the time of this writing, the tool is about 90% done, and Robert is adding the finishing touches. 

SUMMARY

The purpose of the tool is to create a new feature in a "IsolationPolygon" feature class based upon a selected set of features (as shown below). 

Ostensibly the selected set would be created by using the Gas Isolation Trace tool as shown above.  When you click on the ArcMap command, a new polygon is created based upon the geometry of the selected DistributionMain and ServicePipe features.  

ASSUMPTIONS

• The user must be editing to use this tool
• The user must have in his or her map at least three feature classes answering to the model names, DISTRIBUTIONMAIN, SERVICE, and ISOLATIONPOLYGON

OUTSTANDING ITEMS REMAINING (ROBERT M.)

• Create a user interface so that the end user of the application can choose to have either a buffered polygon look (as shown above) or a rectangle representing the minimum bounding rectangle for the isolation polygon
• The UI should include an ability to specify the buffer distance
• Change the icon from the default bunny rabbit to something more appropriate. 
• Modify the manner in which the selected set is retrieved to use Telvent.SE's methodology.  This will add in maintainability...

 Telvent.SE.Module.Elicitation.ObtainMapSelectionSet("modelName");