You can display the current stack of called functions and the source code lines containing the function calls by setting the scope of the call stack.
To set the scope:
Select View > Callstack or click the Callstack button.
The Callstack window appears.
Right-click in the Callstack window.
The pop-up menu of the Callstack window appears.
Select Set Scope.
The Source window appears displaying the function of the selected line. The pointer is set to the line containing the subsequent function call. The scope is set to the selected function.
Set Scope is equivalent to double-clicking a line in the Callstack window.