insert and delete column

hi
i am trying to add a new column to a grid .but when press the add button control is going to the following url. localhost:3000/frms/contactmail.pl Please help .How to add a new column to the existing grid.

To insert new column in grid you may use insertColumn() method. This method is available in PRO version only.
Tutorial is available here docs.dhtmlx.com/doku.php?id=dhtm … sertcolumn