What's new in Telerik RadComboBox v2.8.0
The latest edition of RadComboBox includes major improvements on the client-side API model. This version is fully backward compatible, however, the client-side API has been re-written from scratch to address most of the major problems reported so far. A full list of what has been changed can be found here.
What's new
- Better client-side Validation
- AfterClientCallBackError event
- New ErrorMessage property that shows a custom error message after the Load On Demand CallBack error appears
- TextChanged server event
- New Default skin
What's new in Telerik RadComboBox v2.7.0
The current version features numerous bug fixes and performance optimizations.
What's new in Telerik RadComboBox v2.6.2
- ShowDropDownOnTextboxClick property - allows the users to open the drop-down list only upon clicking the drop-arrow image.
What's new in Telerik RadComboBox v2.6
- Seamless interoperability with ASP.NET AJAX Release Candidate
- Full compatibility with Visual Studio .NET 2005 Service Pack 1 and ASP.NET Web Application Project template
- New SelectOnTab property (select currently highlighted item or leave custom text when AllowCustomText = True)
- The combobox width can be set in percentage values now.
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You should consider the following side-effects: The combobox is shown as a block element and each control, even text that is placed right after the combobox will appear under the combobox. To change this behavior, you can apply style="float:left" to the combobox instance or use any container (i.e. tables) to build the needed layout. If no width is set to the combobox, then 150px is the default value of the width. When the width is set in px values, then the combobox appears wider in design time than it is at run-time. This is only a design time limitation and has no effect on the run-time of the application.
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- Major additions in the documentation (a lot of fresh new help topics which target intermediate/expert developers, a fresh new Getting Started chapter for beginners, etc)
What's new in Telerik RadComboBox v2.5
Screen Boundaries Detection
The drop-down expands to the opposite direction when the screen boundaries are to be crossed.
OffsetX / OffsetY properties
These properties allow you to indicate the horizontal and vertical offset of the dropdown.
ClearItems() client-side method
This method allows you to delete the items on the client-side.
Custom Item Style
You can set combobox items with different appearance using the inherited styling properties from WebControl.
What's new in RadComboBox v2.3
Embedded WebResources
As of our Q2 2006 release all resources (scripts, the default skin, etc) are implemented as Embedded WebResources in ASP.NET 2.0 for a very easy and convenient deployment. The only thing you now need to do is drag r.a.d.combobox from your toolbox onto your web page (no external files will be required). The /RadControls folder will only be needed if you plan to use a skin other than the default or if you make any modifications to the script files.
What's new in RadComboBox v2.2
Compatibility with the new ASP.NET 2.0 MS Atlas framework
Telerik RadComboBox is now compatible with Atlas.
What's new in Telerik RadComboBox v2.1 (part of Telerik RadControls for ASP.NET Q1 2006)
Nested Declarative Data Binding (.NET 2.0 feature)
When Telerik RadComboBox is used as a template for data-specific ASP .NET controls such as GridView, DetailsView, or Telerik RadGrid, you can have the combobox show the currently selected value for the column where it is nested on the current row. You can easily do that using the Edit DataBindings option of the Telerik RadComboBox Smart Tag.

Design-time Features
- The AutoFormat dialog box (.NET 2.0 specific)
- Appearance Customization
Telerik RadComboBox contains a predefined set of CSS-based skins which allow for easy appearance customization. You can also create custom skins of your own.

What's new in Telerik RadComboBox v2.0 (part of Telerik RadControls for ASP.NET Q4 2005)
Support for Multiple Columns
Developers can now define any table structure and it will be applied to all combobox items. The key benefit here is that this is achieved using templates. Table structures can be easily customized and modified on the go, without the need to recompile or code anything.
Multi-column mode supports all advanced AJAX features of the combo a load on demand, auto-complete, etc. Items loaded on demand are automatically formatted using the templates as well.

Static Column Headers
Headers are especially useful in multi-column mode (though they can be used in any other combo mode as well). You can use the header to assign column titles for each combo column. The header does not scroll when items go up/down and is always visible a end-users can easily associate column data to its respective column title in the header. Headers are also defined using templates and you can have any content there, even images.

Enhanced End-Users Restriction Policies
You can now control whether end-users can enter text that is not predefined in any of the combobox items. All you have to do is set the AllowCustomText property. By default it is set to true, i.e. typing is allowed. If the AllowCustomText property is set to false the input for the combobox is restricted only to match the strings present in the combobox items.

Expand Effects
The way the combobox dropdown displays is specified with setting just a single property. You can choose between seventeen animated expand effects to control the way the combobox dropdown appears. (IE 5.5+ only).
Multi-item Autocomplete
Telerik RadComboBox now supports multiple autocomplete using any delimiter (";" , ",", etc.) just like in Microsoft OutlookA.

Support for External Streamer Pages
For complex load-on-demand scenarios, when combobox is added dynamically to the page or is not initially visible, you can use ExternalCallBackPage. ExternalCallBackPage is a normal ASP.NET aspx page that contains only one instance of Telerik RadComboBox. The ID of this instance should match the ID of the combobox initiating the request. You can then wire the ItemsRequested event handler of the external combobox and write your custom logic, the same way you would do in the original page. Finally, set the ExternalCallBackPage property of the original combobox to the name of the callback (streamer) page. The path is relative to the current path of the parent page (e.g. no path needed if the streamer page is in the same folder - just the name of the file).

What's new in Telerik RadComboBox v1.5 (part of Telerik RadControls for ASP.NET Q3 2005)
XHTML Compliance
Telerik RadComboBox now provides complete XHTML 1.1 compliance. The HTML output that is generated by default is fully XHTML 1.1 compliant.
Accessibility Compliance
Telerik RadComboBox is "Level A" compliant (in accordance with the W3C Web Accessibility Guidelines 1.0). It also introduces certain features that satisfy the requirements of "Section 508" for software accessibility. As a result, the component can be used in US Federal Institutions and other organizations that require software to be accessible to people with disabilities.
Section 508 Compliance
In compliance with Section 508 regulations, Telerik RadComboBox is fully navigable using the keyboard. Telerik RadComboBox can be accessed with the Tab Key as well as with an Access Key shortcut. You can use arrow keys to open and close the combobox and navigate through the items. Items can be selected with Space or Enter keys.

Telerik RadComboBox displays item tooltips which enables special accessibility readers like JAWS to pronounce the tooltip of the highlighted item.
Autocomplete Client-Side
End users can now autocomplete combobox items that have been loaded on the client without the need of callbacks.
General
Powerful Auto-Complete Functionality
Telerik RadComboBox has full autocomplete support - while you type into the input area, the combobox fires a server-side event that returns all the relative matches for the currently typed text.
AJAX-based Load On Demand
Telerik RadComboBox can load data on demand based on the current value of the combobox input field. Whenever the state of the input changes, Telerik RadComboBox fires a server-side event with the current state of the input as a parameter.
Content Template Support
You can embed any content inside a Telerik RadComboBox template, including HTML markup and ASP.NET server controls, as well as other third-party controls (and any control from the Telerik RadControls for ASP.NET suite as well).

Flexible Binding Mechanism
- DataBinding: Telerik RadComboBox fully supports binding to collections, tables and datasets.
- Programmatic Binding: Telerik RadComboBox provides a rich and easy-to-use server-side API, so you can easily populate your combobox with any number and type of items.
- SQL Binding: You can easily bind Telerik RadComboBox to the result of any SQL query.
- XML String Binding: Telerik RadComboBox provides rich API for working with XML. You can load data from an XML static content file or you can directly load XML.
Validation
You can use the built in ASP.NET validation with Telerik RadComboBox.

Support for Custom Attributes
Telerik RadComboBox provides full support for custom attributes both on the server and on the client. It is very easy to include an image in your combobox item, for example.

Multi-Language Support
You can use any language with Telerik RadComboBox. Just make sure you've set the appropriate Html encoding (and XML encoding in case you are using XML Content Files).

Multiple Comboboxes on a Single Page
You can easily setup any number of instances of Telerik RadComboBox on the same page that interact with each other based on certain client-side or server-side events.

Support for Right-to-Left Languages
Telerik RadComboBox provides full support for Right-to-Left languages.