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 true;
		}
		return false;
	}
	/**
	 * Validates target column can paste another column.
	 * 
	 * @param targetObj
	 *            target table/grid column
	 * @param transferData
	 *            copy data of table/grid column
	 * @param isNew
	 *            true: insert and paste; false: override and paste
	 * @return can paste
	 */
	public static boolean handleValidateContainColumnPaste(
			ColumnHandle targetObj, ColumnBandData transferData, boolean isNew )
	{
		int columnNumber = HandleAdapterFactory.getInstance( )
				.getColumnHandleAdapter( targetObj )
				.getColumnNumber( );
		Object parent = targetObj.getContainer( );
		if ( parent instanceof TableHandle )
		{
			if ( isNew )
			{
				return ( (TableHandle) parent ).canInsertAndPasteColumn( transferData,
						columnNumber );
			}