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>> i am using DHTMLX gird , it has the option of column hiding and show.
>> but there is one instance , if i hide all the columns , i am unable to show columns once again.
If you mean "header menu" feature - latest version ( dhtmlxgrid 2.0 build 81107 ) has modification which deny hiding of last visible column, which solves above problem.

yes , for that is there any .js file to be added