First, thank you JKI for your great tool that makes the design of my UIs so much easier! I successfully added my own themes and controls to the JKI Design Palette but I noticed some controls are not supported.
Arrays and clusters with no elements: data structures like arrays and clusters require to have elements to be added to the Palette. Adding arrays or clusters that don't have elements make all the controls in the JKI Design Palette disappear as shown below. In the future, I think it would be great to be able to add our own arrays and clusters that don't have a type to the Palette.
Decorations: decorations can't be added to the Palette. I tried to add my own decorations to the Palette and it looks like they are not supported. It didn't make the other controls disappear like above but I think it would be a great improvement to have access to decorations (classic or our own) via the JKI Design Palette.