bCheckLayer
(Optional parameter) Indicates whether to verify the existenece of the layer as given by the LayerName property (which is specified by the GraphicObjectAttributes property). Possible values are:
| Value | Meaning | 
| VARIANT_TRUE | Verify the existence of the layer to which the object will be added. If the layer doesn�t exist, the method will return an error. | 
| VARIANT_FALSE | Add the object without checking the existence of the layer. | 
The default value of this parameter is VARIANT_FALSE.