The code below has stopped working on version 4.2.1.744

Code:
getClass: function(v,metadata,r,rowIndex,colIndex,store){
   this.items[0].tooltip = r.get("inf");
}
or

Code:
getTip: function(v,metadata,r,rowIndex,colIndex,store){
   return r.get("inf");
}

Alternatively, I am using the code below:

Code:
renderer: function(v,metadata,r,rowIndex,colIndex,store,view){
   metadata.tdAttr = 'data-qtip="' + Ext.htmlEncode(r.get("inf")) + '"';
}