LineMarkerExplorer
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Demonstrates use of the LineMarker feature of FlexChart.

The sample demonstrates the use of the LineMarkers in the FlexChart.
A LineMarker displays the precise data values for a given position on
the chart by dragging horizontal and/or vertical lines over the plot
with an attached label. It is useful in scenarios, where a user has a
lot of data in a line or area chart, or if a user wants to display
data from multiple series in a single label. With built-in
interactions, such as Drag and Move. a user can drag the line marker
and more precisely select the data point on the chart.

