UltrachartOverviewExtensions

uses this technique http://stackoverflow.com/questions/10279092/how-to-get-child-by-type-in-wpf-container and this technique http://social.msdn.microsoft.com/Forums/vstudio/en-US/b879f391-f350-4813-b509-b725dc1668b1/how-to-find-datatemplate-generated-element-in-an-itemscontrol?forum=wpf to bind the UltrachartSurface at the first child in an ItemsControl as the ParentSurface on a UltrachartOverview