I know you have special tag structure so that you can implement certain features.  However, for UI elements like the drop-down, numeric input and date-picker, it would be really great to use (or have an alternative control to us) native html elements and data- attributes that are easily recognized by mobile devices and newer, desktop browsers.  For example, for the drop-down, it would be great for it to render a select so that when received by a mobile device, the native option selector can take over.  I am posting this in the Web controls for those of us creating responsive apps where the input surrounded by spans doesn't really work out very well when the page is rendered on a mobile browser.  I realize that are trade-offs so maybe instead of completely disregarding the current controls, maybe another, pure control, or some configuration option to the current controls would be preferable. That way, the developer could decide what was more important - the UI enhanced feature or compatibility with device.

Please Add Skin Chooser control

To use Kendo UI as View part of MVP pattern where Model and Presenter reside in GWT it is important to have a GWT wrapper for Kendo UI.

Today, the only way to change the date in kendoDatePicker is to show the calendar and select another date, but in scenarios where i want to allow my user to move one day at a time as defaule, a left arrow and rigt arrow will be great.
same thing holds for the kendoNumericTextBox, althogh he has the up/dowun arrows, they are relitevly small and a Plus and Minus icons to the right and left of the widget will be easier for a fingure to tuch.

Enable the user to show the icon in a different place than the default. like the right of the text and not juts to its left.

I think a Kendo UI plugin for WordPress would be a potentially massive hit with WordPress users and developers. I saw here http://www.kendoui.com/blogs/teamblog/posts/12-02-29/q_a_from_kendo_ui_webinar_q1_2012.aspx that you can use Kendo UI with WordPress. That is great, but an actual plugin would be awesome. Of course there are plenty of ways you could go about it - these are just a couple broad suggestions that come to mind. Offer a free WP plugin available to current Kendo UI customers seeking simplified integration with WP. Or, offer a premium/paid WP plugin to potential customers who would like to use Kendo UI with WordPress site(s) only. 

you can able to change background image in kendo ui slider.

Take a look at DevExpress DXperience...

You can currently set series labels to position "center" on the pie chart to get them to render on the slices, but sometimes slices are too small to contain these labels. It would be great if there were an option for the chart to detect when a slice is too small and render the label outside the chart, while still rendering labels on pie slices that are big enough to contain them.

For these tools to create ID's for all actionable items and allow them to be named(Telerik's Default)or by the developer as the developer creates them.

KendoUI Mobile currently has only back button. There should also be a forward button along with it.

Where several pie charts are displayed above each other, it would be nice to specify a consistent diameter or max width for the legend (when the legend is displayed to the side) to ensure all the pies line up together. Longer legend items then need to wrap.

The loading text of kendo.ui.progress is hard coded. 

Please make it localizable.

Allow multiple header lines in the grid - eg two header lines first line contains four columns the next eight. The first col provides a visual grouping to the second header

Ruby server wrappers. We need it!

Suggested fix

                if (a != null && b !== null) {
                    return a > b ? 1 : (a < b ? -1 : 0);
                }

                if (a == null && b == null) {
                    return 0;
                }

                if (b == null) {
                    return 1;
                }

                return -1;

I would like to be able to configure a tooltip to be shown if the user hovers over an x-axis category. I would also like it to be dynamic based on the category. 

My use case is each x axis category represents a flight, to keep the label succinct I use the flight number, however it would be good if the user could find out more information about the flight such as the date, departure, destination etc.

Currently I put this information in the tooltip for the data series, but when I show multiple data series this text looks out of place and also makes it harder to see the data relating to the data series point.

Provide means to specify if a legend item needs to displayed or not, either through a configuration API which can take a condition on the value / series, or through an event when the legend is being added. This will make it easy to manipulate the legends that are displayed. Additionally, having an event to hook into, can also provide means to add custom functionality, like click handling, to the legend items.

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!

I want specific column in Kendo UI grid canbe disable columnMenu! Now only can disable sortable and filterable but not the whole columnMenu~