The dialog appears when you selelct Customized from the drop-down list of the Show Fields property, which is in the Hint category of the chart pater of a heat map in the Report Inspector. It allows you to select fields to show as the heat map hint, which displays when the mouse pointer points at the data marker in Designer view mode, in HTML result, or at runtime on JReport Server. See the dialog.
From the Resources box select a field and click 
to add it into the right box to make its value shown as the hint. Repeat this to add more fields. The names of the selected fields will be displayed in the value cell of the Show Fields property, separated by ",".
OK
Applies the changes and closes the dialog.
Cancel
Does not retain any changes and closes the dialog.
Help
Displays the help document about this feature.
