Bug 136270 Group's data binding column can only be used by the group itself
If you add some data binding columns to a group, these columns can only be used by this group itself. It should has a way to make the child can use the parent group's data binding column.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
{
		ActionHandle actionHandle = null;
		if ( element instanceof LabelHandle )
		{
			actionHandle = ( (LabelHandle) element ).getActionHandle( );
		}
		else if ( element instanceof DataItemHandle )
		{
			actionHandle = ( (DataItemHandle) element ).getActionHandle( );
		}
		else if ( element instanceof ImageHandle )
		{
			actionHandle = ( (ImageHandle) element ).getActionHandle( );
		}
		return actionHandle;
	}
	/**
	 * Sets the handle of the action of the given element.
	 * 
	 * @param element
	 *            the element handle to set
	 * @param action
	 *            the action
	 * 
	 * @return the handle of the action, or null if the element is not a proper
	 *         type
	 * 
	 * @throws SemanticException
	 */
	public static ActionHandle setAction( ReportItemHandle element,