GetPreviewImage returns null in Rebar-Shape

[Arciviz]

FilteredElementCollector RBShpColl = new FilteredElementCollector(doc).OfClass(typeof(RebarShape));
         
Bitmap Stirrups_bitmaps;
         foreach(RebarShape shape in RBShpColl)
         {
            if(shape.RebarStyle == RebarStyle.StirrupTie)
            {
               Stirrups_bitmaps =  new Bitmap( shape.GetPreviewImage(new Size(100 , 100)));
            }
         }

[Mustafa.Salaheldin · Accepted solution]

Select the Rebar and look at the "Properties" pane, if there is no image then you will get a null value when you are using the GetPreviewImage method.

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[Arciviz]

How revit shows images in "rebar shape browser".