Bug 146796 Error message pop up if display text contain non-digital char when add next item
Description: In decimal type parameter creation,display type is "list box", Error message pop up if "display text" contain non-digital char when add next item. Steps: 1.Create a new decimal parameter 2.Set display type as "list box" 3.Input one item: value:1, display text:test 4.Input another item: Value:2 Actual result: error message pop up: The display text already exists! Expected result: Input item succussfully.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
}
	private void refreshDataSets( )
	{
		String selectedDataSetName = dataSetChooser.getText( );
		String[] oldList = dataSetChooser.getItems( );
		String[] newList = ChoiceSetFactory.getDataSets( );
		if ( oldList.length != newList.length )
		{
			dataSetChooser.setItems( newList );
			if ( StringUtil.isBlank( selectedDataSetName ) )
			{
				dataSetChooser.select( 0 );
				refreshColumns( false );
			}
			else
			{
				dataSetChooser.setText( selectedDataSetName );
			}
		}
	}
	private void refreshColumns( boolean onlyFilter )
	{
		if ( columnChooser == null )
		{
			return;
		}
		if ( !onlyFilter )
		{
			DataSetHandle dataSetHandle = inputParameter.getModuleHandle( )
					.findDataSet( dataSetChooser.getText( ) );