Roles don't work about gwt-charts HOT 11 CLOSED

I meant: “All series on a given axis must be of the same data type”

I got a little further.. 

When setting the role via 
DataColumn col = DataColumn.create(ColumnType.BOOLEAN);
col.setRole(RoleType.CERTAINTY);
dataTable.addColumn(col);

I get following error:
(Error) 
@com.googlecode.gwt.charts.client.DataTable::addColumn(Lcom/googlecode/gwt/chart
s/client/DataColumn;)([JavaScript object(110832)]): Invalid type: function() {
      var result = __static(dispId, this);
      if (result[0]) {
        throw result[1];
      } else {
        return result[1];
      }
    }.

DataColumn in general doesn't seem to work.

DataTable dataTable = DataTable.create();

//fails:
DataColumn dataColumn = DataColumn.create(ColumnType.STRING);
dataColumn.setLabel("Year");
dataTable.addColumn(dataColumn);

//works:
dataTable.addColumn(ColumnType.STRING, "Year");

Concerning the javascript error reported above, when using the DataColumn class.
I have been able to work around the problem by changing the following method in 
the DataColumn class.

Original Code :

private final native void setType(String type) /*-{
        this.type = [email protected]::getName();
    }-*/


Replaced code:
private final native void setType(String type) /*-{
        this.type = type;
    }-*/

[deleted comment]

[deleted comment]

Cool, would be great to get this in the next build. I don't manage to rebuild 
the jar (I'm not used to Maven)

Thanks for the patch!
Already commited and scheduled for the next release.

thanks for the patch.

this worked too: 

extend DataTable and add and use this method:

public final native int addCertaintyColumn()/*-{
     return this.addColumn({type:'boolean',role:'certainty'});
     }-*
/;

see 
http://stackoverflow.com/questions/11979871/gwt-chart-api-googlecode-how-to-set-
roletype-to-a-column-of-a-datatable