[OpenLayers-Users] Leaving a polygon in the map which can't be removed in the Vector Layers

[Kevin Yang]

Hi dear sir,
  When I using the draw feature function of OpenLayers, it sometimes leaves
a geometry(such as a polygon) in the map which can't be removed in the
Vector Layers, even after I close the draw control using "toggle('none')".
How can I deal with this issue?
best regards,
Yang
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