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/ui/actions/BaseInsertMenuAction.java
else if ( model instanceof DesignElementHandle )
		{
			DesignElementHandle handle = (DesignElementHandle) model;
			if ( handle.getDefn( ).isContainer( ) )
			{
				int slotId = DEUtil.getDefaultSlotID( handle );
				if ( handle.canContain( slotId, insertType ) )
				{
					return handle.getSlot( slotId );
				}
			}
			return handle.getContainerSlotHandle( );
		}
		return null;
	}
	protected Request insertElement( ) throws Exception
	{
		Request request = new Request( IRequestConstants.REQUEST_TYPE_INSERT );
		Map extendsData = new HashMap( );
		extendsData.put( IRequestConstants.REQUEST_KEY_INSERT_SLOT, slotHandle );
		extendsData.put( IRequestConstants.REQUEST_KEY_INSERT_TYPE, insertType );
		extendsData.put( IRequestConstants.REQUEST_KEY_INSERT_POSITION,
				InsertAction.BELOW );
		request.setExtendedData( extendsData );
		if ( ProviderFactory.createProvider( slotHandle.getElementHandle( ) )
				.performRequest( model, request ) )
		{
			return request;
		}
		return null;