In my application, I create Node on the context menu click, basically user's right clicked position we use for creation of new Node. It is working fine in 100% zoom of diagram. However in our application we have 110% default zooming, where when I try to add node by right clicking, it is been created at some distance to the point where right click is made. When I drag diagram to expand it in right and down direction, the more I go right and down........ the more distance I observe between the point where right click is made and the point where the node is created. I want the node creation to happen at the position where right click is made, regardless of the zoom factor.

I use the following code in the context menu item's click handler, to get the position where context menu is created.

System.Windows.Controls.MenuItem menuItem = sender as System.Windows.Controls.MenuItem;
System.Windows.Controls.ContextMenu menu = menuItem.Parent as System.Windows.Controls.ContextMenu;
Point newPosition = menu.TranslatePoint(new Point(), diagram);
 

Now this newPosition I use to create new node.

Kindly let me know, how I should handle the above situation?