ICImagingControl.OverlayUpdateEventEnable Property
This property is used to return or set whether the overlay update event should be called by IC Imaging Control.
Syntax: 
Public OverlayUpdateEventEnable As Boolean
Limitations:

Run time only.
Remarks:

The OverlayUpdateEvent property is set to True per default.

Sample:

This example demonstrates how to check, whether the overlay update event should be called. 

If ICImagingControl1.DeviceValid = True Then
    ' Check whether the overlay update event is enabled.
    If ICImagingControl1.OverlayUpdateEventEnable = False Then
        ' Enable the overlay update event.
        ICImagingControl1.OverlayUpdateEventEnable = True
    End If
End If
See also: ICImagingControl, OverlayUpdate event, OverlayBitmap Class

<< ICImagingControl