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.setDataType( DATA_TYPE_CHOICE_SET.findChoiceByDisplayName( dataTypeChooser.getText( ) )
								.getName( ) );
					}
					catch ( SemanticException e1 )
					{
						ExceptionHandler.handle( e1 );
					}
				}
			}
		} );
		createLabel( propertiesGroup, LABEL_DISPLAY_TYPE, maxStrLengthProperty );
		displayTypeChooser = new Combo( propertiesGroup, SWT.DROP_DOWN
				| SWT.READ_ONLY );
		displayTypeChooser.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		displayTypeChooser.setItems( new String[]{
				DISPLAY_NAME_CONTROL_LIST, DISPLAY_NAME_CONTROL_COMBO
		} );
		displayTypeChooser.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				if ( selectedParameter != null
						&& selectedParameter != newParameter )
				{
					try
					{
						String newControlType = getSelectedDisplayType( );
						if ( PARAM_CONTROL_COMBO.equals( newControlType ) )
						{
							newControlType = DesignChoiceConstants.PARAM_CONTROL_LIST_BOX;