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 ( defaultValue != null && defaultValueRemoved )
					{
						changeDefaultValue( null );
					}
				}
			}
		} );
		changeDefault = new Button( buttonBar, SWT.TOGGLE );
		changeDefault.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				SelectionChoice choice = (SelectionChoice) ( (IStructuredSelection) valueTable.getSelection( ) ).getFirstElement( );
				if ( isDefaultChoice( choice ) )
				{
					changeDefaultValue( null );
				}
				else
				{
					changeDefaultValue( choice.getValue( ) );
				}
				refreshValueTable( );
				changeDefault.getParent( ).layout( );
			}
		} );
		createPromptLine( tableAreaComposite );
		updateTableButtons( );
		createSortingArea( valueArea );
	}
	private void switchToText( )
	{