Updates the display.
Normally, the WPFViewPortControl display will automatically update if the viewport of the associated
WPFChartViewer object is changed. So calling
updateDisplay is not necessary. However, if the display needs to be updated for other reasons, such as if the viewport border color has been modified, this method can be used to notify the WPFViewPortControl that the modification has been completed so that it can update the display.
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