tooltips on header of the KPIs

Hello, Angelo,
 
Thank you for your question.
 
This can be achieved via the customizeCell() API call.
 
With the customizeCell() API call you can get access to the wanted header cells and add your tooltip class to them.
 
Please see the following thread: https://www.flexmonster.com/question/how-to-have-a-header-multiline/, a working solution can be found here.
 
Let us know if this works for you.
 
Best Regards,
Vera 

Hello, Angelo,
 
Thank you for your response.
 
In order to set a custom tooltip for the headers, you can specify the desired tip the following way: 

customizeCell: function(cell, data) {
  if (data && data.rowIndex == 1) {
     // Specify the tooltip text
     cell.attr["title"] = "PS: This is a category type";
  }
}

Here is a JSFiddle example for illustration.
 
 
If you would like to set a separate custom tooltip for each header, you can specify the desired tooltip text in an array and then assign them like this:

customizeCell: function(cell, data) {
  if (data && data.rowIndex == 1) {
     //The data.columnIndex for the headers starts the count from 1, hence 1 is subtracted
     cell.attr["title"] = tooltips[data.columnIndex-1];
  }
}

Here is a JSFiddle example for illustration.
 
 
Please let us know if this approach works fine for you.
 
We are looking forward to hearing from you.
 
Best Regards,
Vera