You're probably right about there being some event that is being triggered by the click on the button - in fact if you just hover the mouse over one of the arrows, it highlights - which indicates some event is firing. But just because an event is firing, it doesn't mean that the OSI developers have exposed the event so that you can use it.

Two possibilities come to mind - neither particularily attractive.

The most bullet-proof one is to create left and right arrows (from the Symbol Library, perhaps or a Polygon), enable scripting for them, position them so they cover the arrows on the trend and then group your arrows and the trend. You then will have to use your arrow's Click event to both update your Date and Time pickers. You'll also have to calculate the new start and end times and then pass them to the trend by calling the trend's

Trend1_TimeRangeChange(ByVal StartTime As String, ByVal EndTime As String)

with the appropriate time strings.

Of course, it gets worse, in that you'll probably need to do the same for the 'revert button' and the zoom-in and zoom-out buttons on the trend.

The other possibility is to monitor the sequence of trend events and take appropriate actions re your Date and Time pickers. The events you do have access to that are relevant are the Trend's Click and TimeRangeChange events. A bit of testing shows that the TimeRangeChange event occurs BEFORE the Click event when the trend's right and left arrows are clicked.

Therefore, you could add to the TimeRangeChange event code to store the Now() in a global variable. Then in the trend's click event, you would add a test of that global value to see if the Click was preceeded by less than some small amount by a TimeRangeChange and if so, you would conclude that the Click event was associated with a user's click on the trend arrows and reset your pickers. You may need a high precision timer - Now() may not have adequate resolution (a search on VBA high resolution timer will turn one or more up). This approach would probably result in more picker updates than necessary, but fewer than if you used TimerangChange only.

Hope this helps - please be sure to tell us what you decided to do - even if it is something as low-tech as using Texts to display the start time and end times near the pickers (at least the user would have a local visual indicator of the times...)

James