New skins I have installed don't show in the list

I have downloaded a couple of new skins ( BlueNight & defaultblackwt) and I have installed them by following the true launch bar instructions.

The new skins I've installed don't show up in the drop down list of skin names.

All I have is these ones in the list:

<default>
Luna
Luna II
XP Silver

Can you please suggest what may be the problem?

As I see the BlueNight is the skin for TLB Clock plugin, defaultblackwt is the skin for turn off computer plugin.

The skins for plugin you can select in the properties of the plugin not in the TLB settings.