* Returns the disconnected text block or null, if no block were disconnected.
*/
public TextBlock disconnectTextBlock(TextBlock textBlock) throws RQLException {
Container blocksContainer = getBlocksContainer();
if (blocksContainer.isChild(textBlock.getPage())) {
blocksContainer.disconnectChild(textBlock.getPage());
return textBlock;
}
// signal that given text block is not a child
return null;
}