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
{
		private TableViewer viewer;
		public TableContentProvider( TableViewer viewer )
		{
			this.viewer = viewer;
		}
		public Object[] getElements( Object inputElement )
		{
			if ( viewer == categoryTable )
			{
				return provider.getCategory( );