Follow Current Context Property

When set to True (default value), shows attribute values for up to 10 tags from the selected asset on the trend. The historized tags are picked from the currently selected asset in alphabetical order, up to the maximum set by the Max Content Tags to Show property. Tags are shown only from th first connected Historian Server.

With the property set to true, trend pens are auto-discovered and loaded asynchronously. This can cause unpredictable results if you will use the ShowContent() method to place the Historical Trend control into a pane at run time, or if the Follow Current Context property can be dynamically modified at run time. In these cases, set Follow Current Context to FALSE.

Note: If Follow Current Context is set to False, the Show Tag Picker property must be set to True.

IMPORTANT: In prior releases, Historical Trend App properties were not exposed. System Platform 2017 Update 3 exposes a number of configurable properties and sets some to a default value. For example, in Updates 1 and 2, the TagPicker was visible when you used the Historical Trend App. In Update 3, the TagPicker is not visible by default, since tags from the current context are shown when Follow Current Context is true.