Doug,The TOC widget seems to add the horizontal bar automatically when it is sized smaller than the list (between the plus sign and dropdown arrow).I think what you are running into is that the toc box for the list is too small for the length of your layer names and are getting truncated. If you narrow your TOC widget so that you can not see the plus sign and dropdown (where zoom to is), you should see the horizontal scroll bar.If this is the case, in the TOCWidget.mxml at the bottom, the width of the box being populated is controlled in this part of the code:<toccomp:TOC id="toc"
width="100%"
height="100%"
labels="{[ZoomToMakeVisible,ExpandAll,CollapseAll]}"
useesridescription="{UseNewEsriDescrption}"
expanded="{expanded}"
disableZoomTo="{disableZoomTo}"
fullexpanded="{fullexpand}"
legendCollapsed="{legendCollapsed}"
liveScrolling="false"
variableRowHeight="true"
tocMinWidth="{wTemplate.width - 45}"
scroller="{scr}"
loader="{boxMessage}" paddingTop="0" paddingBottom="0"/>
</s:Group>
If you hard code that to a number that is large enough to fit your layer names (tocMinWidth="500"), then it will push the drop down off the window and thus should add the scroll bar.R_