public NavigationToolBar(TreeViewMultipleSelect tree, Image backIcon, Image forwardIcon)
 {
     // register the tree with this
     this.tree = tree;
     // and register me with the history so it can fire events on us
     if (tree.history != null)
         tree.history.toolBar = this;
     EventHandler backwardEvent = new EventHandler(tree.NavigateBackward);
     backward = makeButton("Backward", backIcon, backwardEvent);
     EventHandler forwardEvent = new EventHandler(tree.NavigateForward);
     forward = makeButton("Forward", forwardIcon, forwardEvent);
     OnAfterNavigation();
 }
 public NavigationHistory(TreeViewMultipleSelect tree)
 {
     this.tree = tree;
 }