ProgramDnDTree getTree(String treeName) {
		TreeViewProvider provider = providerMap.get(treeName);
		if (provider != null) {
			return provider.getProgramDnDTree();
		}
		return null;
	}
Get the program tree for the given tree name.

@param treeName name of tree in the program (also the name of the view)
@return ProgramDnDTree tree, or null if there is no provider for the
        given name
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreePlugin.java