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
{
		super( parentShell, title );
	}
	/**
	 * Constructor.
	 * 
	 * @param title
	 */
	public CascadingParametersDialog( String title )
	{
		super( title );
	}
	protected Control createDialogArea( Composite parent )
	{
		Composite composite = (Composite) super.createDialogArea( parent );
		UIUtil.bindHelp( parent, IHelpContextIds.CASCADING_PARAMETER_DIALOG_ID );
		GridData data = new GridData( );
		data.widthHint = 600;
		maxStrLengthProperty = getMaxStrLength( PROPERTY_LABEL_STRING,
				composite );
		maxStrLengthOption = getMaxStrLength( OPTION_LABEL_STRING, composite );
		composite.setLayoutData( data );
		createGeneralPart( composite );
		createChoicePart( composite );
		createDynamicParamsPart( composite );
		createPropertiesPart( composite );
		createOptionsPart( composite );
		return composite;
	}
	private void createGeneralPart( Composite parent )