I have found a solution for it. Although not the best but gets the job done
Code
var columns = grid.columns;
if(grid.columns!=undefined){
for(var i =1; i<columns.length; i++){
var column = columns[i];
if(column!=undefined){
var colItems = column.items;
if(colItems!=undefined){
var colItem = colItems.items[0];
if(colItem!=undefined){colItem.setVisible(true);}
}
}
}
}