Here's some code I got elsewhere (I don't remember where) that does what you're looking for.
Put this in your JavaScript section:
/* Create the Right UI Bar. Swap the two lines below to start stowed instead of unstowed. */
var $rightUiBar = $('<div id="right-ui-bar"></div>').insertAfter("#ui-bar");
/* var $rightUiBar = $('<div id="right-ui-bar" class="stowed"></div>').insertAfter("#ui-bar"); */
var rightTray = $rightUiBar.append('<div id="right-ui-bar-tray"><button id="right-ui-bar-toggle" tabindex="0" title="Toggle the Right UI bar" aria-label="Toggle the Right UI bar" type="button"></button></div>');
var rightBody = $rightUiBar.append('<div id="right-ui-bar-body"></div>');
/* Attach the toggle button click. */
$rightUiBar.find('#right-ui-bar-toggle').ariaClick({
label : "Toggle the Right UI bar"
}, function () {
$rightUiBar.toggleClass('stowed');
});
/* Automatically show the contents of the StoryRightSidebar passage in the right-ui-bar-body element. */
postrender["Display Right Sidebar Contents"] = function (content, taskName) {
setPageElement('right-ui-bar-body', 'StoryRightSidebar');
};
/*
To have your code stow the bar use:
<<addclass "#right-ui-bar" "stowed">>
To unstow the bar use:
<<removeclass "#right-ui-bar" "stowed">>
*/
Put this in your Stylesheet section:
/* Styling and Colours of the Right UI Bar. */
#right-ui-bar {
background-color: #222;
border-right: 1px solid #444;
text-align: center;
}
#right-ui-bar-toggle {
font-size: 1.2em;
line-height: inherit;
color: #eee;
background-color: transparent;
border: 1px solid #444;
}
#right-ui-bar-toggle:before {
font-family: tme-fa-icons;
font-style: normal;
font-weight: 400;
font-variant: normal;
text-transform: none;
line-height: 1;
speak: none;
}
/* Layout and Positioning of the Right UI Bar. */
#right-ui-bar {
position: fixed;
z-index: 50;
top: 0;
right: 0;
width: 17.5em;
height: 100%;
margin: 0;
padding: 0;
-webkit-transition: right .2s ease-in;
-o-transition: right .2s ease-in;
transition: right .2s ease-in;
}
#right-ui-bar-tray {
position: absolute;
top: .2em;
left: 0;
right: 0;
}
#right-ui-bar-toggle {
display: block;
position: absolute;
top: 0;
left: 0;
border-left: none;
padding: .3em .45em .25em;
-webkit-user-select: none;
}
#right-ui-bar-toggle:before {
content: "\e81e";
}
#right-ui-bar-body {
height: 90%;
height: calc(100% - 2.5em);
margin: 2.5em 0;
padding: 0 1.5em;
}
#right-ui-bar-body {
line-height: 1.5;
overflow: auto;
}
#story {
margin-right: 20em;
}
/* Stowing of the Right UI Bar. */
#right-ui-bar.stowed {
right: -15.5em;
}
#right-ui-bar.stowed #right-ui-bar-toggle {
padding: .3em .55em .25em .35em;
}
#right-ui-bar.stowed #right-ui-bar-toggle:before {
content: "\e81d";
}
#right-ui-bar.stowed #right-ui-bar-body {
visibility: hidden;
-webkit-transition: visibility .2s step-end;
-o-transition: visibility .2s step-end;
transition: visibility .2s step-end;
}
#right-ui-bar.stowed~#story {
margin-right: 4.5em;
}
And then create a passage named "StoryRightSidebar". Now the text and code you put in that passage will appear in the right-side UI bar.
Enjoy!