In the full version there is this code:
renderEntityNavigationLink: function (objectRef, text, imgCls, imgSrc, formContext, formName, sectionName, descr, rowIndex, target)
{
return renderLink (
text,
imgCls,
imgSrc,
"Ext.ComponentMgr.get ('" +
this.m_grid.getId () +
"').m_parser.navigateToEntity('" +
objectRef.objectName +
"'," +
objectRef.objectId +
"," +
(formContext ? "'" + formContext + "'" : "null") +
"," +
(formName ? "'" + formName + "'" : "null") +
"," +
(sectionName ? "'" + sectionName + "'" : "null") +
"," +
rowIndex +
"," +
(target ? "'" + target + "'" : "null") +
");",
(descr ? descr : AwareApp.QueryLayoutParser.prototype.strNavigateTo + " " + objectRef.objectName));
},
The last parameter to this function is the tooltip - either an operation description or a hardcoded string. If you make it null you will get rid of the tooltip forever.