Another new feature added in the Design Time Environment in visual studio 2005 and 2008 for windows forms and windows user controls designers is the Snaplines.

What is a snapline?

A snapline is a dynamically generated UI layout guide line. Snaplines are generated during control move operations in the designer. The location of other controls on the design surface provide the lines.

All controls by default inherit the default the Snaplines which appear while moving that interact with Tops, Lefts, Bottoms and Rights of other controls, with the form border, spacings from other controls and some other. One remarkable snapline is the one that appears while moving a Label control beside TextBox controls the purple snapline that aligns the text position instead of the control position. More...

One more advantage you get from building a custom designer for your custom controls is that you can add smart tag panel to add important most used properties and methods.

What is a Smart Tag?

SmartTag is one of the new enhancement of VisualStudio 2005 design time and VS 2008 as well. Smart tags are menu-like user interface (UI) elements that supply commonly used design-time options. Most of the standard components and controls provided with the .NET Framework contain smart tag and designer verb enhancements. More...

This post is simple and neat, the goal now is to add some designer verbs, so lets get straight.

What is a Designer Verb?

A designer can use the DesignerVerb class to add menu commands to the shortcut menu for the component it provides designer support for in design mode. Designer verbs associate a menu item with an event handler. Designer verbs are provided to the design-time environment by the Verbs property of the IDesigner interface. More...

As I  mentioned in introducing the Designer post that one of the designer powers is filtering the control members, filtering here means removing or adding members (Properties, Events or Attributes) to the DesignTime Environment in the PropertyWindow.

The IDesignerFilter interface has the methods that enable filtering the members that appear in the Design time PropertyWindow. 

The IDesignerFilter interface has 6 methods for filtering.

Why for each Properties , Events and Attributes there is a Pre and Post Filter method?
More...

What is a Designer?

Designers are objects that have the ability to modify a component’s design time behavior on a
design surface. A designer can display a component’s user interface as well as allow property
changes to the component. It can also provide other services and perform additional processing
specific to the component it is associated with. More...