Lightbox is the most way to show pictures, so I want KendoUI include it and expand. It can be show images, gallery, flash, video, audio even dynamic HTML & external pages, and can be play, pause, previous, next, close and so on...
This is the plugin I used: http://shadowbox-js.com

Currently a datasource model field can have a "validation" definition, where each is treated as a validation rule. This allows for a custom rule to be added (e.g., a function to check the field value is not a duplicate), but there is no way to define the associated custom message - it would be nice if we could define "messages" to go with the rules (or maybe specify a validation object?).

Please ensure when altering the treeview (adding checkable items) that it supports multi level and tri state parent nodes (shows as partially selected when not all child nodes are selected)

Telerik is pushing their support for Angular pretty hard now, and I think that is wonderful. But with it, you're still leaving the documentation on the matter pretty sparse and kind of obscure.

Right now, it is kind of tucked away out of sight here: http://docs.telerik.com/kendo-ui/getting-started/introduction

Though to your credit, you __have__ updated all of the demos with an _Angular_ example, which is __very appreciated__ and I thank you much for it.

I think it would make me, and many others I know, a lot more comfortable if the support for Angular were treated a bit more first class. As long as it continues to be put in out of the way places, it still feels very 'unofficial' or 'tentative'. Could we possibly get a more expansive documentation right on the demos page, perhaps under "tools", or a new actual "Angular" folder on the primary API documentation?

Provide a bundle for TextMate that includes snippets and code coloring.

WebStorm 3.0  is the coolest JavaScript IDE at this point in time and I think its the best complement for Kendo client development. It can be also seen by many developers as perfect statement of Declaration of Independence from Microsoft on behalf of Telerik!

A couple of suggestions for UI widgets

1. Time Pie - A small circle not unlike a pie chart, with the full 24 hour cycle around its perimeter. Example: http://oakland.crimespotting.org/

2. Calendar Week Bar Chart - A bar chart associated to the calendar week. Example: http://oakland.crimespotting.org/

Like k-textbox and k-button css provided with kendoUI - I would like to have it extended for simple box with title, expand collapse button etc. This may be more like [Group] control in winforms. so we can group the controls and enable/disable it as needed.

Currently there is no way to tell when a new connection is created between two shapes.  The add event is called when the connection line first appears on the screen, but there is no event to capture when the connection is made to another shape.  

This would be extremely helpful when users are creating flow charts and assigning prerequisites by drawing connections.  

The step style for lines in a chart is very useful for logging digital data changes however in Kendo it only can be applied to line charts and not scatter lines where it would be very useful for telemetry displays.

A choice of step first or step last where the visual change appears attached to the previous point on on the new point would be especially useful.

Having the ability to do "in-line edits" can sometimes be helpful.  Here is a link to a jquery plugin I use often. Perhaps this would be something useful for Kendo.

http://www.appelsiini.net/projects/jeditable

What i think of it is converting checkboxes list into more friendlu UI element. For example we have list of checkboxes with the same name but different key

Name="checkname[1]"

and so on. So i set something like

$(".checkbox[name=Checkname]").kendoCeckboxes()

Then kendo convert it in to togle buttons. You can set how namy columns for example. And it will convert to something like table with every cell as toggle button and selected options are highlighted. Of course you do not use table html elemnt i just describe idea.

This will be more friendly as on desktops as on tablets. 

The Book control is great in Silverlight. It may be possible to create a similar control in Kendo

When working with AJAX it's essential to be able to validate a form on the fly, return errors, and deal with them without needing to actually submit the form. Please make sure the validation library works as a callable method rather than just a form submit event binding.

I've experimented with the Kendo UI on my iPad, with the VoiceOver feature enabled and some of the widgets work well, but not all do.
Adding support for VoiceOver would add a huge level of accessibility to our apps.

The forum is great but missing some critical features.

- Search a specific Topic area "Kendo UI Framework" or forum like "Data Source"
- Active Threads (show threads updated to today or since last visit)
- More notification options

A Calendar control for Kendo UI Mobile would be awesome.

Seems like lots of Chart features are yet to be implemented.  I want to use jQuery to hack positioning of elements like axis titles and replacing some rendered paths with images, but without classes the selections would be expensive and maybe imprecise.

This will help take some of the heat off Telerik while users wait for more functionality in the next release. Let us modify what we need!

In some specific cases, it is required to show a bubble within a bubble in the Bubble chart. This is required to demonstrate some specific property within the bubble.
e.g.
The bubble position shows which project.
The bubble size demonstrates projects size with respect to the program.
The bubble within the bubble shows the current progress of the project.