Bug 121352 The data set binding property cannot be retrieved in report preview layout
In report preview page, the datasource/dataset property binding lists cannot be retrieved. The dataset binding can not work correctly in layout preview because it's value cannot get from the binding list. But in the data set edit page, the binding value can be got. You can refer to the attachment.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
/**
	 * Returns the slot that contains the given content element.
	 * 
	 * @param content
	 *            the element to find
	 * @return the number of the slot that contains the element, or -1 if this
	 *         element does not contain the content element.
	 */
	public int findSlotOf( DesignElement content )
	{
		IElementDefn defn = getDefn( );
		int count = defn.getSlotCount( );
		for ( int i = 0; i < count; i++ )
		{
			if ( getSlot( i ).contains( content ) )
				return i;
		}
		return -1;
	}
	/**
	 * Checks whether the property of current element is editable.
	 * 
	 * @return <code>true</code> if the property of current element is
	 *         editable. Otherwise <code>false</code>.
	 */
	public boolean canEdit( )
	{
		return !isRootIncludedByModule( );
	}
	/**