The aggregation level selector allows you to calculate a call graph for
If you have set a custom call tree root in the call tree view, a check box is displayed that lets you limit the call graph to that root. It is selected by default, if you deselect it, the call graph will be calculated for the entire call tree.
and can be sorted on all columns. Initially it is sorted by self time to show the most interesting hot spots at the top of the table.
You can add further nodes later on with the node selection dialog.