Step by step instructions on how to reproduce the problem:

1. Create a kendo tab strip
2. Using the append method, add a "tab1"- do not specify any content in this new tab
3. Using the insertBefore method, add a "tab2", this time specify some content
4. Attempt to navigate the tabs and note what is showing in the content of each tab

Code snippets:

            var tabStrip = $("#contentlessAppend").kendoTabStrip({}).data('kendoTabStrip');
            tabStrip.append({
              text: "noContentAppend",
              //content: "With content" //Uncomment this line for normal functionality
            });
            tabStrip.insertBefore({
              text: "contentInsertBefore",
              encode: false,
              content: `<div id="WhereAmI">I am not where I should be</div>`
            }, tabStrip.tabGroup.children().eq(0) );

Screenshots of the problem:

 (N/A)

Stack trace, if applicable: N/A

Project and its dependencies which illustrates the problem (stripped, in zip format):

(see attached)

Need to have simple textbox (input) widget

As a developer, I want to be able to add paragraphs with empty content and not have it stripped, so that I can add custom functionality, like icons.

I want to be able to control if the paragraph's content should be stripped or have the editor allow empty elements when they have classes.

Currently, if I add markup similar to a font awesome icon or some custom icon in a paragraph, there is a function, _fillEmptyElements, that strips the content of the paragraph:

Input:

<p> <i class="fa fa-check" style="color: green;"></i> </p>

or

<p>&nbsp;<span class="customicon icon-iconname"></span>&nbsp;</p>

On save, the paragraph's content is stripped to:

<p>&nbsp;</p>

As a workaround, I can add dummy text in the paragraph:

https://dojo.telerik.com/oHIpusIL

Current when using the HierarchicalDataSource you can only load one level of data at a time. I would like to be able to pre-populate the entire tree (but have the ability to refresh it via remote data, should I so need).

@Html.DevExpress().ComboBox(
    settings => {
        settings.Name = "comboBox4";
        settings.Width = 180;
        settings.SelectedIndex = 0;
        settings.Properties.DropDownWidth = 550;
        settings.Properties.DropDownStyle = DropDownStyle.DropDownList;
        settings.CallbackRouteValues = new { Controller = "Editors", Action = "MultiColumnComboBoxPartial" };
        settings.Properties.CallbackPageSize = 30;
        settings.Properties.IncrementalFilteringMode = IncrementalFilteringMode.StartsWith;
        settings.Properties.TextFormatString = "{0}";
        settings.Properties.ValueField = "CustomerID";
        settings.Properties.ValueType = typeof(string);

        settings.Properties.Columns.Add("ContactName", "ContactName", 130);
        settings.Properties.Columns.Add("CompanyName", "CompanyName", Unit.Percentage(100));
        settings.Properties.Columns.Add("Country", "Country", 60);
        settings.Properties.Columns.Add("Phone", "Phone", 100);
    }
).BindList(ViewData["Customers"]).GetHtml()

We need the bar of series to be draggable and also its value can be changed on drag.
For example, a user is given a chart like below link:
http://demos.kendoui.com/dataviz/bar-charts/column.html.
Below the chart, a table is given for data. Chart is loaded with false data. User is expected to plot the correct graph based on the table data given. For this, user will drag the bar in up/down direction to set it to the desired value.

It would be nice to have onClick callback as a part of drawing props in spreadsheet.
Scenario:
When I have more than one image on a spreadsheet, on click of those images I want to get info about the image more specifically range of the topLeft cell the image is attached to.
I have explained a lil bit more here, and I also have a work around here for now but if we have onClick call back it will give us bit more control over the images in spreadsheet. 

It would be nice that export-to-excell feature supports the text orientation which is supported by MS Office and Open Office. This feature lets the user to have vertical text in the worksheet.

It would be beneficial to add additional support for tooltips natively on the Bubble Layer in RadMap

Merge ListView and MobileListView implementations to have a single ListView with support for Grouping, PullRefresh, Infinite Scrolling etc.

For ex. Using a MobileListView with a single item per row on an ipad pro is a waste of space. But there is no support for applying grids ( purecss or bootstrap ) to the mobile listview. This is possible with the web listview but then you lose features like grouping, infinite scrolling, load more, etc.

Hence please make a single SuperListView with wider functionality support. 

It would be nice to have navigation methods like 'nextRecord', 'previousRecord' to select grid records. These methods must  take care of paging issues and load next/previous page automatically and select the correct record afterwards. I've implemented these methods on my side nut it would be easier to have them natively as part of the grid implementation.

Provide or change the current default value of Aggregation from 'Max' to 'None', so that user can select his desired aggregation from UI.

Implement an option to preload some data for mobile list view in endless mode. This would increase UI time because there is allready data defined in HTML to view, the user must not wait for a datasource to load

I love your controls except Validator. I have finally made my own, where I can write multiple functions to evaluate each input just like this in typeScript:
new Helpers.Validate([
                { name: 'postId', test: [(e) => { if (e == "") return "Chose a post."; }] },
                { name: 'creditor, test: [(e) => { if (e == "") return "Chose a creditor"; }, ] },
                { name: 'description', test: [
                    (e) => { if (e == "") return "Make a description"; },
                    (e) => { if (e.length < 15) return "Your description are to short "; },
                ]
                }, ]);
It is now a pleasure to make forms and perhaps you will consider to reevaluate the structure of your Validator that I have been struggling with workarounds on for so many hours the last two years. 
Kind regards from Kenneth

Expand your Moonlight theme for use with the Mobile UI

when the mobile view uses a header, containing a toolbar as header it would be nice to be able to have a view title like in the navbar.

Box Plot (Box and Whisker) works great but would like to have Vertical instead of horizontal.

If we need to run some code in all of views, there is no way to do it besides add the call to each and every view in the project. In a large scale project that might have 100 views in many seperate folders and sub folders - this become a nightmare.

You should add the ability to add a generic event to all the views (kind of a "base class" for view) or by implementing the attached event via the application definition [var app = new kendo.mobile.Application()...]

Thanks,
ilan.