Bug 122869 Drag a parameter from data explorer view into a table in library, a new parameter is created automatically.
Description:Drag a parameter from data explorer view into a table in library, a new parameter is created automatically. Steps to reproduce: 1. Add a cascading parameter and a table in a library file. 2. Drag a parameter from data explorer view into a table cell in layout editor. 3. Find that a new parameter was added in data explorer view automatically.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ExpressionBuilder.java
} );
		ToolItem undo = new ToolItem( toolBar, SWT.NONE );
		undo.setImage( ReportPlatformUIImages
				.getImage( ISharedImages.IMG_TOOL_UNDO ) );
		undo.setToolTipText( TOOL_TIP_TEXT_UNDO );
		undo.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				sourceViewer.doOperation( ITextOperationTarget.UNDO );
			}
		} );
		ToolItem redo = new ToolItem( toolBar, SWT.NONE );
		redo.setImage( ReportPlatformUIImages
				.getImage( ISharedImages.IMG_TOOL_REDO ) );
		redo.setToolTipText( TOOL_TIP_TEXT_REDO );
		redo.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				sourceViewer.doOperation( ITextOperationTarget.REDO );
			}
		} );
	}
	private void createExpressionField( Composite parent )
	{
		Composite expressionArea = new Composite( parent, SWT.NONE );
		expressionArea.setLayout( new GridLayout( 2, false ) );
		expressionArea.setLayoutData( new GridData( GridData.FILL_BOTH ) );
		Composite composite = new Composite( expressionArea, SWT.BORDER );
		composite.setLayoutData( new GridData( GridData.FILL_BOTH ) );
		composite.setLayout( UIUtil.createGridLayoutWithoutMargin( ) );