A Trend is the graphical representation of a Data Sample. Therefore, to implement a Trend graph, you must:

1. Define a Data Sampler that contains at least one Feed.
   Each feed will be represented as a curve on the Trend graph.
2. Place and configure a Trend widget on a display.
3. In your application, use the Data Tags within the Sampler to start, end and pause the data feeds.

In addition to the standard Trend graph widget, where the X axis is time, you can create a graph using the XY Trend widget. This enables you to define units such as millibar or degrees for the X axis.

You can view a video tutorial on this subject on the following link:

http://www.youtube.com/watch?v=pSAm1HVvOO4&list=PLFBq_OH6_be7snAZAycZzQMvAWjHkX9Pz