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
}
				return DesignerConstants.fontSizes[DesignerConstants.fontSizes.length - 1][0];
			}
		}
		else
		{
			return DesignChoiceConstants.FONT_SIZE_MEDIUM;
		}
	}
	private static String getSmallerFontSize( DesignElementHandle handle )
	{
		if ( !( handle instanceof ReportItemHandle ) )
		{
			if ( handle instanceof ModuleHandle )
			{
				for ( int i = DesignerConstants.fontSizes.length - 1; i > 0; i-- )
				{
					if ( DesignChoiceConstants.FONT_SIZE_MEDIUM.equals( DesignerConstants.fontSizes[i][0] ) )
					{
						return DesignerConstants.fontSizes[i - 1][0];
					}
				}
			}
			if ( handle instanceof GroupHandle )
			{
				handle = handle.getContainer( );
			}
		}
		Object fontSizeValue = getModelFontSize( handle );
		if ( fontSizeValue instanceof DimensionValue )