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 null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.dnd.AbstractTransferDropTargetListener#handleDrop()
	 */
	protected void handleDrop( )
	{
		updateTargetRequest( );
		updateTargetEditPart( );
		
		if ( DNDService.getInstance( )
				.performDrop( TemplateTransfer.getInstance( ).getTemplate( ),
						getTargetEditPart( ),
						DND.DROP_DEFAULT,
						new DNDLocation( getDropLocation( ) ) ) )
		{
			return;
		}
		boolean isScalarparameter = false;
		boolean isResultSetColumn = false;
		boolean isEmbeddImage = false;
		final Object template = TemplateTransfer.getInstance( ).getTemplate( );
		Assert.isNotNull( template );
		Assert.isTrue( handleValidateDrag( template ) );
		AbstractToolHandleExtends preHandle = null;
		String transName = null;
		if ( template instanceof String )