Bug 189374 AbstractToolHandleExtends occurs when click the cancle button of Aggregation builder
Description: AbstractToolHandleExtends occurs when click the cancle button of Aggregation builder Build number: 2.2.0.v20070528-1033 Steps to reproduce: 1, Drag the Aggregation into a table's group header 2, Click cancel button stop the insert operation Expected result: The insertion is cancelled without exceptions Actual result: The insertion is cancelled but AbstractToolHandleExtends occurs. Error log: java.lang.Error: Don't find the AbstractToolHandleExtends at org.eclipse.birt.report.designer.internal.ui.palette.BasePaletteFactory.getAbstractToolHandleExtendsFromPaletteName(BasePaletteFactory.java:1146) at org.eclipse.birt.report.designer.internal.ui.palette.ReportTemplateTransferDropTargetListener.handleDrop(ReportTemplateTransferDropTargetListener.java:163) at org.eclipse.gef.dnd.AbstractTransferDropTargetListener.drop(AbstractTransferDropTargetListener.java:171) at org.eclipse.jface.util.DelegatingDropAdapter$3.run(DelegatingDropAdapter.java:211) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:850) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:46) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:193)
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/AggDataDropAdapter.java
{
	public static final String TEMPLATE = "DATA_AGG"; 
	public static final String TRANS_NAME = Messages.getString( "AggDataDropAdapter.Trans.Name" ); 
	
	public int canDrop( Object transfer, Object target, int operation,
			DNDLocation location )
	{
		if ( transfer instanceof Object[] )
		{
		}
		if ( transfer.equals( TEMPLATE )
				&& target instanceof TableCellEditPart )
		{
			CellHandle cellHandle = (CellHandle) ( (TableCellEditPart) target ).getModel( );
			int slotId = cellHandle.getContainer( )
					.getContainerSlotHandle( )