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
{
				dataSetChooser.setText( inputParameter.getDataSetName( ) );
			}
			refreshColumns( false );
			String columnName = getColumnName( inputParameter.getValueExpr( ) );
			if ( columnName != null )
			{
				columnChooser.setText( columnName );
			}
			columnName = getColumnName( inputParameter.getLabelExpr( ) );
			if ( columnName != null )
			{
				displayTextChooser.setText( columnName );
			}
			if ( getSelectedDataType( ).equals( DesignChoiceConstants.PARAM_TYPE_STRING ) )
			{
				if ( defaultValue == null )
				{
					defaultValueChooser.select( 1 );
				}
				else if ( defaultValue.equals( "" ) )
				{
					defaultValueChooser.select( 2 );
				}
				else
				{
					defaultValueChooser.setText( defaultValue );
				}
			}
			else if ( defaultValue != null )