Bug 180426 In library, do not allowed the dataset drag in to the row and column area of cross tab[1102]
Description: In library do not allowed the dataset drag in to the row and column area of cross tab[1102] Build number: 2.2.0.v20070402-0630 Steps to reproduce: Try to drag a dataset in data explorer into the row area and column area in x-tab. The plus icon show the operation is allowed, But after the insertion, error occurs. Expected result: The dataset is not allowed to insert into the row and column area Error log: java.lang.ClassCastException: org.eclipse.birt.report.item.crosstab.internal.ui.editors.model.VirtualCrosstabCellAdapter at org.eclipse.birt.report.designer.core.commands.CreateCommand.execute(CreateCommand.java:102) at org.eclipse.birt.report.designer.internal.ui.command.WrapperCommandStack.execute(WrapperCommandStack.java:86) at org.eclipse.gef.dnd.AbstractTransferDropTargetListener.handleDrop(AbstractTransferDropTargetListener.java:314) at org.eclipse.gef.dnd.TemplateTransferDropTargetListener.handleDrop(TemplateTransferDropTargetListener.java:101) at org.eclipse.birt.report.designer.internal.ui.palette.ReportTemplateTransferDropTargetListener.handleDrop(ReportTemplateTransferDropTargetListener.java:230) at org.eclipse.gef.dnd.AbstractTransferDropTargetListener.drop(AbstractTransferDropTargetListener.java:171) at org.eclipse.jface.util.DelegatingDropAdapter$3.run(DelegatingDropAdapter.java:211)
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/palette/ReportTemplateTransferDropTargetListener.java
return false;
	}
	/**
	 * Validates drag source from palette, layout, or data view
	 * 
	 * @param dragObj
	 * @return validate result
	 */
	private boolean handleValidateDrag( Object dragObj )
	{
		if ( DNDService.getInstance( )
				.validDrop( TemplateTransfer.getInstance( ).getTemplate( ),
						getTargetEditPart( ),
						DND.DROP_DEFAULT,
						new DNDLocation(getDropLocation( )) ) )
		{
			return true;
		}
		return dragObj != null
				&& ( handleValidatePalette( dragObj )
						|| handleValidateOutline( dragObj )
						|| handleValidateInsert( dragObj ) || handleValidateLibrary( dragObj ) );
	}
	private boolean handleValidatePalette( Object dragObj )
	{
		return dragObj instanceof String
				&& ( getTargetEditPart( ) == null || ReportCreationTool.handleValidatePalette( dragObj,
						getTargetEditPart( ) ) );
	}
	/**