y_model = yaxis_model;
y_colnames = yaxis_colnames;
methods = dobj_methods;
treeroot = treetrunk.getTreeRoot();
depth_max = treeroot.getTreeNodeID().depth;
nesting_stacks = new NestingStacks( tree_view );
map_line2row = null;
drawn_boxes = new DrawnBoxSet( tree_view );
// timeframe4imgs to be initialized later in initializeAllOffImages()
timeframe4imgs = null;