We would like to adapt the xamDataChart control so that the user can highlight regions of the chart. In some kind the function is similar to the zoom / pan function, but instead of panning / zooming the selected region should be shown a little different (e.g. alpha-blended). The function should allow to select a specific region of the X-Axis, Y-Axis selection is not needed so the whole height of the plot can be used.

After looking at the source I think that re-using the zoom / pan thing would not be the best way and instead developing something new here is the better way.  My plan is:

• Adding a path which represents the selected are
• Registering for MouseLeftButtonDown, MouseMove and MouseLeftButtonUp which trigger the selection
• Updating the added path upon a mouve move
• Calling a custom event handler after the selection is finished

Now I have some questions:

1. How do get access to the PlotAreaBorder from outside. Is the PlotAreaBackgroundContent right?
2. How do I get the dimensions of the plot. Again: Is PlotAreaBackgroundContent right?
3. How do I highlight the selected region afterwards. I thought about re-using the info-strips from the samples but these are in the background (meaning that the plot is in front of it). Or would I need to add a custom UI element such as a path which is used for the highlighting?

Kind regards