Must be called when the pointer (mouse or touch) is pressed down or tapped on the control.
AutomationImageViewer.prototype.onAutomationPointerDown = function(args)
onAutomationPointerDown(args: AnnPointerEventArgs): void;
args
AnnPointerEventArgs that contains the location information on the pointer event.
OnAutomationPointerDown implementation must trigger the AutomationPointerDown event.
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