Copy key entries

To copy key entries the following steps should be performed:

1. check all key entries that are to be copied
   
2. press the "Copy" button.
3. move the tree cursor to the entry after which copied keys should be inserted.
   
4. press the "Paste" button. The copied keys (red square) are inserted after the cursor position (blue square) as it is shown on the picture below:
   .
5. press the "OK" button to confirm changes. NOTE: if the dialog is closed with Atl-F4 or the "Cancel" button all changes will be dropped.