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do your xhtmltree have a extension that a could implement a context menu for right click for each of them items in a tree.

for  example the options in a context menu

 
delete item

move up item

move down item

edit item

...

Pro version of dhtmlxTree supports integration with dhtmlxMenu, which can be used as context menu. In such case the menu handler will receive Id of selected menu item and Id of item it tree for which action called, so any kind of logic (including operation in your example) can be implemented.

You can check samples/pro_context_menu.html

If you haven't found the needed information there and still looking for a solution, you will find the additional help checking simple javascript calendar and datagrid editable.