I think you need to first change the layout to inline (by UI or code), in order 
to delete an image.

but the attribute "wk anchor layout" is not settable with WP SET ATTRIBUTES
http://doc.4d.com/4Dv16R6/4D/16-R6/4D-Write-Pro-Attributes.300-3605889.en.html

so you need to use INVOKE ACTION instead.

syntax: anchorLayout?value=inline
http://doc.4d.com/4Dv16R6/4D/16-R6/Using-4D-Write-Pro-standard-actions.200-3605850.en.html#3610756

only then can you clear the selected image.

> 2018/05/24 8:03、Justin Carr via 4D_Tech <4d_tech@lists.4d.com> のメール:
> INVOKE ACTION(ak clear;ak current form)




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