title: ExtJs add tool tip to grid cell text
body: <p>I am using Extjs for creating UI. So I created grid, with column. My task is to add tool tip to some cells but only on part of text.
   I tried to use <code>meta.tdAttr = 'data-qtip="Activity is in use"';</code> looks like it works, but sets tooltip on whole cell, when I want only on some text.</p>
  
  <p>Here is my realization:</p>
  
  <pre><code>                        {
                              hideable : false,
                              width : 200,
                              flex : 1,
                              dataIndex : 'name',
                              text : 'Name',
                              renderer :  function(value, meta, record) {
                                  meta.tdCls += ' '
                                          + this.getValidation()
                                                  .getHighestLevelCls(
                                                          record.modelType,
                                                          record.id);
                                  var inUseClass = '';
                                  if (record.get('descendants').length &gt; 0) {
                                      meta.tdAttr = 'data-qtip="Activity is in use"'; // here is tool tip setter
                                      inUseClass = Glyphs
                                              .getIconClass('dot-circle-o');
                                  } else {
                                      inUseClass = Glyphs
                                              .getIconClass('circle-o');
                                  }
                                  return Glyphs.wrapClass(inUseClass,
                                          'font-size:10; color:black;',
                                          '&amp;nbsp;&amp;nbsp;')
                                          + value;
                              }
                          }
  </code></pre>
  
  <p>As you can see in cell I print Glyph (it is some kind of icon interpretated as text, taken from AwesomeFonts.com) + value (text value), so I need to show tooltip when I hover with mouse only Glyth. Maybe someone can suggest me any sollution? </p>