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Grid - Hide one column fixed

Hello,

I am using Dhtmlx Pro version.
I have a Grid / TreeGrid and I was wondering if there was a way to hide a column, but not to let the user select to see it in case I add this funcionality with the "grid selection of columns" functionality.

Do I have to use userData for this particular cases?

Thanks
Andres

>>grid selection of columns
Do you mean columns' hiding using header menu? In such case it can be done only with code modification. 
In the file dhtmlxgrid_hmenu.js line 81 (inside dhtmlXGridObject.prototype._createHContext=function() function):
for (var i; i<this.hdr.rows[1].cells.length; i++){
var c=this.hdr.rows[1].cells[i];
if (c.firstChild && c.firstChild.tagName=="DIV") var val=c.firstChild.innerHTML;
  else var val = c.innerHTML;
  if (val!="UNNECESSARY COLUMN LABEL") { 
a.push("<div class='dhx_header_cmenu_item'><input type='checkbox' column='"+true_ind+"' len='"+(c.colSpan||1)+"' checked='true' />"+val+"</div>");
true_ind+=(c.colSpan||1);
}
}

Thank you very much for your fast reply.
I will try this out.
Andres