This works for me:

panel.add(new HTML("<hr />"));


On Tuesday, June 3, 2014 2:32:50 PM UTC-4, cellepo wrote:
>
> I tried dominique calcinelli's suggestion but could not figure out how to 
> get around this error:
>  Node cannot be inserted at the specified point in the hierarchy
>
> So I eneded up just making an <hr/> with HTML Widget instead, per this 
> other related discussion:
> https://groups.google.com/forum/#!topic/Google-Web-Toolkit/NMjozOU4UXk
>
>
> On Friday, February 22, 2013 11:46:26 AM UTC-5, dominique calcinelli wrote:
>>
>> First create the HTML <hr/> tag :
>>
>>     InlineHTML hrTag = new 
>> InlineHTML().wrap(Document.get().createHRElement());
>>
>> Then use it as follows :
>>    
>>         myPanel.add(hrTag);
>>
>>
>>

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