Trace Start Trigger breakpoint dialog box
The Trace Start Trigger dialog box is available from the context menu that appears when you right-click in the Breakpoints window.

Use this dialog box to set a Trace Start Trigger breakpoint where you want to start collecting trace data. If you want to collect trace data only for a specific range, you must also set a Trace Stop Trigger breakpoint where you want to stop collecting data.
In the editor or Disassembly window, right-click and choose Trace Start Trigger from the context menu.
Alternatively, open the Breakpoints window by choosing View>Breakpoints.
In the Breakpoints window, right-click and choose New Breakpoint>Trace Start Trigger.
Alternatively, to modify an existing breakpoint, select a breakpoint in the Breakpoints window and choose Edit on the context menu.
In the Break at text box, specify an expression, an absolute address, or a source location. Click OK.
When the breakpoint is triggered, the trace data collection starts.
