Dear Vinitha,
Thank you for your reply. I have already found this section in the documentation, but it basically shows how to use the multi-selection input, and its layout is not the same than the dropdown input of the default editor window for resources.
The default resource input brings automatically the color indicator for each resource. See the picture below:

I would like to render this input in my few custom Editors, such I have it homogeneous though the application.
Thank you