Bug 188027 PasteAction is diabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SlotHandle.java
/**
	 * Drops a content element from the slot, and unresolve any reference
	 * property which refers the element to drop.
	 * 
	 * @param content
	 *            a handle to the content to drop
	 * @throws SemanticException
	 *             if the content is not within the slot
	 */
	public void drop( DesignElementHandle content ) throws SemanticException
	{
		if ( content == null )
			return;
		ContentCommand cmd = new ContentCommand( getModule( ),
				new ContainerContext( getElement( ), slotID ) );
		cmd.remove( content.getElement( ), true );
	}
	/**
	 * Drops a content element at the given position from the slot, and clear
	 * any reference property which refers the element to drop.
	 * 
	 * @param posn
	 *            the position of the content to drop
	 * @throws SemanticException
	 *             if the position is out of range
	 */
	public void dropAndClear( int posn ) throws SemanticException
	{
		DesignElement content = getElement( ).getSlot( slotID ).getContent(
				posn );