Bug 135497 Data Type is not correct when "Generate All" for Data item
Description: Create a sample datasource and dataset. Insert a data into layout, bind with the dataset.Click "Generate All" to get the Data Binding columns, but the displayed data type is not consistent with the actual one.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/tools/ReportCreationTool.java
type = ReportDesignConstants.EXTENDED_ITEM;
			}
		}
		return type;
	}
	/**
	 * Validates specified creation type can be inserted to layout editor.
	 * 
	 * @param objectType
	 *            specified creation type
	 * @param targetEditPart
	 * @return validate result
	 */
	public static boolean handleValidatePalette( Object objectType,
			EditPart targetEditPart )
	{
		return objectType instanceof String
				&& targetEditPart != null
				&& DNDUtil.handleValidateTargetCanContainType( targetEditPart.getModel( ),
						ReportCreationTool.getCreationType( (String) objectType ) )
				&& DNDUtil.handleValidateTargetCanContainMore( targetEditPart.getModel( ),
						1 );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.tools.CreationTool#handleMove()
	 */
	protected boolean handleMove( )
	{