internal PropertyItem( DescriptorPropertyDefinitionBase definition )
: base( definition.IsPropertyGridCategorized )
{
if( definition == null )
throw new ArgumentNullException( "definition" );
this.DescriptorDefinition = definition;
this.ContainerHelper = definition.CreateContainerHelper( this );
definition.ContainerHelperInvalidated += new EventHandler( OnDefinitionContainerHelperInvalidated );
}