Change All Layers' Plot Style Setting

[parker.depriest356295]

I'm trying to write some code that will
1) set the current plot style table to "BCR Plot Style.stb"
2) change all layer properties to plot style name "Grayscale"

(defun c:grayscale ()

(vl-load-com)
  
 (vla-put-StyleSheet
    (vla-get-ActiveLayout
  	(vla-get-ActiveDocument (vlax-get-acad-object))
    )
    "BCR Plot Style.stb"
  )

    (setq layers (vla-get-layers
   (vla-get-ActiveDocument (vlax-get-acad-object))
        )
  )
  (vlax-for l layers
    (progn
 	(vla-put-plotstylename l "Grayscale")
    )
  )
 )

  )

This routine works after I go into the layer properties manager, highlight all layers, change the plot style to "Grayscale" and then back to "Normal".
It's like it hasn't recognized "Grayscale" as a valid option until it has been manually set.

Is there some way I can make AutoCAD "recognize" Grayscale as a valid option from the beginning?
I feel like this would be a tblsearch or something similar, but would appreciate any suggestions.

[Opie]

Your desired plot style is not initially listed in the dictionary list. By manually changing it, AutoCAD is adding it to the list. You could change your code to use the command line version of the layer command. It allows the setting of unloaded plot styles.