// constructor
public MainVm()
{
TabbedNavTrees = new TabbedNavTreesVm();
TabbedNavTrees.SelectedNavTree = TabbedNavTrees.NavTrees[0];
SelectedIndexSavedFolderTabs = -1;
}
// constructor constructs Single Tree and TabbedNavTreesVm
public MainVm()
{
// Construct Single tree
SingleTree = new ViewModel.NavTreeVm();
//Construct tabbed trees
TabbedNavTrees = new TabbedNavTreesVm();
TabbedNavTrees.SelectedNavTree = TabbedNavTrees.NavTrees[0];
}