Bug 156632 [Acceptance]Cannot paste theme when select Themes in Outline.
Description: Cannot paste theme when select Themes in Outline. Steps to reproduce: 1. New a library. 2. Select defaulttheme in outline and cut it 3. Select Themes and right click to paste the theme back. Expected result: Paste in context menu can be used. Actual result: Paste is gray
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
{
			return copyColumn( getColumnHandle( transferData ), targetObj, true );
		}
		return false;
	}
	protected static ColumnBandData getColumnHandle( Object transferData )
	{
		if ( transferData instanceof ColumnBandData )
		{
			return (ColumnBandData) transferData;
		}
		if ( transferData instanceof Object[]
				&& ( (Object[]) transferData ).length == 1 )
		{
			return getColumnHandle( ( (Object[]) transferData )[0] );
		}
		return null;
	}
	/**
	 * Pastes table or grid columns to target
	 * 
	 * @param transferData
	 *            column data
	 * @param targetObj
	 *            table
	 * @param isNew
	 *            true: insert and paste; false: override and paste
	 * @return paste succeed or fail
	 */
	protected static boolean copyColumn( ColumnBandData transferData,