In our application, we have a table view which shows the values of some hierarchical model.
For example, the hierarchical model could be
Root |_ Property 1 |_ A parent |_ Property 2
In this case, the table would have 2 columns
Property 1 | Property 2
In the table header, we only show the actual property, but not the parent(s) as there is simply not enough room to display the whole path including all parents (the number of parents can become rather large, and so does the number of columns).
The whole path (which is relevant!) is displayed in the tool tip of the table header. This is of course very hard/near impossible to discover for the users of our application. Does anybody knows a good visual clue to hint towards our users that the tool tip contains relevant information. Or another mechanism to display this information ?
Note that it is possible to sort the data in the table by clicking on the header, in which case there appears an arrow in the column header (right side), indicated it is sorted. This might limit our options to add a visual clue in the header.
In case it is relevant, the table appears in a Java application with a Swing-based front-end.