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
}
	/**
	 * Gets the position after the sibling in the container
	 * 
	 * @param targetObj
	 *            container or sibling
	 * @param canContain
	 *            <code>CONTAIN_PARENT</code> as sibling, others as container
	 * @return the position: after the sibling in the same container, or -1 as
	 *         the last position in the container
	 */
	public static int calculateNextPosition( Object targetObj, int canContain )
	{
		int position = -1;
		if ( canContain == CONTAIN_PARENT )
		{
			DesignElementHandle afterHandle = getDesignElementHandle( targetObj );
			if ( afterHandle != null )
			{
				position = afterHandle.getContainerSlotHandle( )
						.findPosn( afterHandle );
				position++;
			}
		}
		return position;
	}
	/**
	 * Adds new object to container
	 * 
	 * @param container