Bug 191685 [regression]Set default value doesn't work in Report Parameter[0705]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
if ( StringUtil.isBlank( selectedDataSetName ) )
			{
				dataSetChooser.select( 0 );
				refreshColumns( false );
			}
			else
			{
				dataSetChooser.setText( selectedDataSetName );
			}
		}
	}
	private DataSetHandle getDataSetHandle( )
	{
		return inputParameter.getModuleHandle( )
				.findDataSet( dataSetChooser.getText( ) );
	}
	private void refreshColumns( boolean onlyFilter )
	{
		if ( columnChooser == null )
		{
			return;
		}
		if ( !onlyFilter )
		{
			DataSetHandle dataSetHandle = getDataSetHandle( );
			try
			{
				columnList = DataUtil.getColumnList( dataSetHandle );
			}
			catch ( SemanticException e )