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See related issue #649
In TopoRenderer.js, line 542 ... the code does a brute force removal of all objects in the Ext south panel where the elevation graph is displayed. This has implications for the TriMet map app, which also uses the south panel for content other than elevation data (e.g., specifically, a real-time bus location grid when viewing bus routes). The Ext code for the elevation graph (south) panel could use a bit of refactoring, so it plays a bit nicer with in terms of showing and hiding the elevation graph.
Clean up elevation renderer in frontend. Should fix #776 and #649