Using Plugins like gadget on desktop.

First create the new folder somewhere on your disk. Then right-click your top toolbar and select TLB Settings, go to Options->Toolbars and click "New", select your created folder and click OK. This will add your folder into the toolbar list. Now press OK in TLB Settings, right-click the toolbar, select "Switch Toolbar" submenu and click your folder/toolbar name.

The same effect can be reached in other way:
Right-click the empty space of the top toolbar and select "Close Toolbar". Now run the standalone TLB again and select your newly created folder when asked. After selecting the folder TLB will show the toolbar properties dialog box where you can select the side where to dock the toolbar.

To open the toolbar properties for the opened toolbar, right-click the empty space of toolbar and select "Toolbar Properties".

Well, now add the plugin you want on the toolbar and you'll get the "sidebar"