Required library edition:
Required library file: dhtmlxgrid_hmenu.js

enable pop up menu which allows hidding/showing columns

• a string with comma delimited true,false values.
  • true - the column will be shown in the menu
  • false - the column won't be shown in the menu, so you can't hide/show it by this way

mygrid.enableHeaderMenu("false,true,false,false");

See also: setColumnHidden