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
buttonBar.setLayoutData( new GridData( GridData.FILL_VERTICAL ) );
	}
	private void createOperatorsBar( Composite parent )
	{
		String[] operators = provider.getOperators( );
		if ( operators == null || operators.length == 0 )
		{
			return;
		}
		Composite operatorsBar = new Composite( parent, SWT.NONE );
		operatorsBar.setLayout( new GridLayout( 2, false ) );
		operatorsBar.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		Label lable = new Label( operatorsBar, SWT.NONE );
		lable.setText( LABEL_OPERATORS );
		lable.setLayoutData( new GridData( 70, SWT.DEFAULT ) );
		Composite operatorsArea = new Composite( operatorsBar, SWT.NONE );
		operatorsArea.setLayout( UIUtil.createGridLayoutWithoutMargin(
				operators.length, true ) );
		SelectionAdapter selectionAdapter = new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				Button button = (Button) e.getSource( );
				insertText( (String) button.getData( ) );
			}
		};
		for ( int i = 0; i < operators.length; i++ )
		{
			Button button = new Button( operatorsArea, SWT.PUSH );
			button.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
			if ( operators[i] != IExpressionProvider.OPERATOR_SEPARATOR )