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
{
		if ( getColumnHandle( transferData ) != null )
		{
			return copyColumn( getColumnHandle( transferData ),
					targetObj,
					false );
		}
		int canContain = handleValidateTargetCanContain( targetObj,
				transferData,
				true );
		int position = calculateNextPosition( targetObj, canContain );
		if ( position > -1 )
		{
			targetObj = getDesignElementHandle( targetObj ).getContainerSlotHandle( );
		}
		return copyHandles( transferData, targetObj, position );
	}
	/**
	 * Does insert and paste column to table/grid
	 * 
	 * @param transferData
	 *            copy data of column
	 * @param targetObj
	 *            target column of table/grid
	 * @return paste result
	 */
	public static boolean insertPasteColumn( Object transferData,
			Object targetObj )
	{
		if ( getColumnHandle( transferData ) != null )