Bug 177439 Need an easy way to determine default value for a dynamic parameter
Currently, I have to bring up the data set editor, preview the results in the data set and make a mental note of the value to use for a report parameter that depends on a data set. It would be nice to have a drop down on the default value field, such as <Select value> which when selected queries the data set and presents me with a list to select from.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
selectedParameter.setMustMatch( false );
						}
						else if ( PARAM_CONTROL_LIST.equals( newControlType ) )
						{
							newControlType = DesignChoiceConstants.PARAM_CONTROL_LIST_BOX;
							
							selectedParameter.setMustMatch( true );
						}
						else
						{
							selectedParameter.setProperty( ScalarParameterHandle.MUCH_MATCH_PROP,
									null );
						}
						selectedParameter.setControlType( newControlType );
					}
					catch ( SemanticException e1 )
					{
						ExceptionHandler.handle( e1 );
					}
				}
			}
		} );
		createLabel( propertiesGroup, LABEL_DEFAULT_VALUE, maxStrLengthProperty );
		
		defaultValueChooser = new Combo( propertiesGroup, SWT.BORDER );
		defaultValueChooser.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
	}
	private void createOptionsPart( Composite parent )
	{
		optionsGroup = new Group( parent, SWT.NULL );