How to delete one or more customized linestyle(s) from a dgnlib?

Hi,

I've imported some customized linestyles from a rsc-file to a dgnlib file. Is there a way to list what is in my dgnlib-file? How do I delete one or more of the linestyles, which I no longer want to be in my dgnlib-file?

Thank you!

LiPeng of Denmark