forcing a scrollbar to appear

hi I have a module for joomla called RokTabs, it takes a number of articles and displays them i a set on one page with tabs to navigate between them. the problem being is that it doesn't have dynamic height. So if one article has more content than another it makes the whole module. as long as the longest article. I'm fine to fix the height and have a scroll bar, however the scroll bar appears briefly then disappears, the area is scrollable but only with a mouse wheel, any ideas how to keep the scroll bar appearing?
/* Light Theme */

.roktabs-wrapper {padding: 0;}
.roktabs-wrapper .light {position: relative;border: 1px solid #DCDCDC;}
.roktabs-wrapper .light .roktabs-container-inner {position:relative; overflow:hidden;}
.roktabs-wrapper .light .roktabs-container-wrapper {clear:both;position: relative; height:570px; overflow-y:auto }
.roktabs-wrapper .light .roktabs-container-wrapper div {float: left;/*width: 450px;*//*width: 220px;*/}
.roktabs-wrapper .light .roktabs-container-wrapper div.wrapper {padding: 14px;width: auto;}
.roktabs-wrapper .light .roktabs-links {overflow: hidden;margin:0;}
.roktabs-wrapper .light .active-arrows .roktabs-links {margin:0 21px;}
.roktabs-wrapper .light .roktabs-links ul {text-align: left;font-weight: bold;list-style-type: none;padding: 0;overflow:hidden;}
.roktabs-wrapper .light .roktabs-links ul.roktabs-top {margin: 0;background: url(tabbg-light.png) 0 0 repeat-x;height: 32px;}
.roktabs-wrapper .light .roktabs-links ul.roktabs-bottom {margin: 0;background: url(tabbg-bottom-light.png) 0 0 repeat-x;height: 32px;}
.roktabs-wrapper .light .roktabs-links ul li {float: left;padding: 0;margin: 0;text-decoration: none;border-right: 1px solid #DCDCDC;border-bottom: none;color: #666;position: relative;height: 31px;line-height: 31px;}
.roktabs-wrapper .light .roktabs-links ul li span {padding: 0 10px;}
.roktabs-wrapper .light .roktabs-links ul li.first {border-left: 0;}
.roktabs-wrapper .light .roktabs-links ul {border-right: 1px solid #DCDCDC;}
.roktabs-wrapper .light .roktabs-links ul li.last {border-right: 0;}
.roktabs-wrapper .light .roktabs-links ul li.hover {color: #000;}
.roktabs-wrapper .light .roktabs-links ul.roktabs-top {background: url(tabbg-active-light.png) 0 0 repeat-x;color: #000;height: 31px;border-bottom: 1px solid #fff;}
.roktabs-wrapper .light .roktabs-links ul.roktabs-bottom {background: url(tabbg-active-bottom-light.png) 0 0 repeat-x;color: #000;height: 31px;border-top: 1px solid #fff;margin-top: -1px;}
.roktabs-wrapper .light .roktabs-links ul {border-left: 0;}
.roktabs-wrapper .light .roktabs-scroller {position: absolute;bottom: 0;right: 0;height: 32px;}
.roktabs-wrapper .light .arrow-next, .roktabs-wrapper .light .arrow-prev {line-height: 29px;margin: 1px;text-align: center;float: left;cursor: pointer;border: 1px solid #DCDCDC;z-index: 2;width:17px;position:absolute;top:0;height:29px;}
.roktabs-wrapper .light .arrow-next {right:0;background: url(next-light.png) 50% 0 no-repeat;}
.roktabs-wrapper .light .arrow-prev {left:0;background: url(prev-light.png) 50% 0 no-repeat;}
.roktabs-wrapper .light .arrow-next-hover {background-position: 50% -29px;}
.roktabs-wrapper .light .arrow-prev-hover {background-position: 50% -29px;}
.roktabs-wrapper .light .arrow-prev span, .roktabs-wrapper .light .arrow-next span {display: none;}
.roktabs-wrapper .light .roktabs-container-tr, .roktabs-wrapper .light .roktabs-container-inner, .roktabs-wrapper .light .active-arrows {background: #fff;}
.clear {clear: both;}
.roktabs-wrapper .icon-left .tab-icon {vertical-align:middle;margin-right:5px;}
.roktabs-wrapper .icon-right .tab-icon {vertical-align:middle;margin-left:5px;}

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SSupremeConnect With a Mentor Commented:
Try this:
.roktabs-wrapper .light .roktabs-container-wrapper {clear:both;position: relative; height:570px; overflow:hidden; }
.roktabs-wrapper .light .roktabs-container-wrapper div {float: left; height:570px;/*width: 450px;*//*width: 220px;*/}
.roktabs-wrapper .light .roktabs-container-wrapper div.wrapper {padding: 14px;width: auto; overflow-y: scroll;}
WeeziAuthor Commented:
Awesome, thank you very much worked fantastically
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