Bug 190727 [regression]Default value issue when switch report parameter from textbox to listbox.[0705]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
dynamicRadio.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				switchParamterType( );
			}
		} );
		valueArea = new Composite( valuesDefineSection, SWT.NONE );
		valueArea.setLayout( UIUtil.createGridLayoutWithoutMargin( 2, false ) );
		GridData gd = new GridData( GridData.FILL_BOTH );
		gd.heightHint = 230;
		gd.widthHint = 550;
		gd.horizontalSpan = 2;
		valueArea.setLayoutData( gd );
		createLabel( valuesDefineSection, null );
		errorMessageLine = new CLabel( valuesDefineSection, SWT.NONE );
		GridData msgLineGridData = new GridData( GridData.FILL_HORIZONTAL );
		msgLineGridData.horizontalSpan = 2;
		errorMessageLine.setLayoutData( msgLineGridData );
	}
	/**
	 * Set the input of the dialog, which cannot be null
	 * 
	 * @param input
	 *            the input of the dialog, which cannot be null
	 */
	public void setInput( Object input )
	{
		Assert.isNotNull( input );
		Assert.isLegal( input instanceof ScalarParameterHandle );
		inputParameter = (ScalarParameterHandle) input;