Sandbox Solution Capabilities

Complete Article :http://msdn.microsoft.com/en-us/library/ee231562.aspx

In Nutshell

Sandboxed solutions support the following capabilities and elements:

Content Types/Fields

Custom actions

Declarative workflows

Event receivers

Feature callouts

List Definitions

List Instances

Module/files

Navigation

Onet.xml

SPItemEventReceiver

SPListEventReceiver

SPWebEventReceiver

Support for all Web Parts that derive from System.Web.UI.WebControls.WebParts.WebPart

Web Parts

WebTemplate feature elements (instead of Webtemp.xml)

Visual Web Parts

Sandboxed solutions do not support the following capabilities and elements:

Application Pages

Custom Action Group

Farm-scoped features

HideCustomAction element

Web Application-scoped features

Workflows with code