How to add custom color to TInspectorBar item

I have an TInspectorBar component where one of the items is of propertytype, ptColor. Is it possible to add a custom color to the dropdown list?

I'm already doing a similar thing with a TColorBox;  ColorBox1.Items.InsertObject(1,'Invisible',TObject(clNone))
and would like to do the same in a TInspectorBar.

Sorry, at this time this isn't possible with the built-in color picker.
We'll consider extending the component to enable this.