The key-in for the dialog box is
MDL KEYIN REF DIALOG REFERENCE
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You could set one of the F keys to this or make a button.
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But I'm not sure how to default right to the raster interface for each option. I did a browse of "ref.ma" and IT seems like the key-ins are
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(rasterAttachType.Interactive)
(rasterAttachType.Fixed)
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As to how you combine the two as one sentence to do what you wish ,,,is a lost to me.
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Hopefully the "dialog box" button or key save some time.
Sorry.
Maybe someone else in here might be able to take it from this point and fill in the missing pieces.
Rich