### Bug report

The change event is not triggered, when a checkbox is selected in the Keno UI TreeList widget.

### Reproduction of the problem

1) Create a checkbox selectable TreeList widget;

2) Select/check any of the checkboxes;

3) The change event is not triggered;

4) Unselect/uncheck any of the checkboxes;

5) The change event is triggered;

A Dojo sample for reproduction: https://dojo.telerik.com/EWUFOhip

### Expected/desired behavior

The change event should be triggered, when a checkbox is selected in a checkbox selectable TreeList widget.

### Environment

* **Kendo UI version:**2021.1.119
* **jQuery version:** 1.12.4
* **Browser:** [all]

Bug report

TreeList Drag and drop row to the bottom of the list does not work when the bottom item has no children

Reproduction of the problem
1. Open the following Dojo: 

https://dojo.telerik.com/eTiZONIj

2. Drag Jane and Drop it under Maria

Current behavior

Jane goes above Maria
Expected/desired behavior
Jane shall be placed at the bottom of the list under Maria

Environment
Kendo UI version: 2020.3.1118
Browser: [all]

### Bug report

When the columns of the Kendo UI TreeList have the attributes option set, a JavaScrip error is thrown. 

### Reproduction of the problem

1. Set the attributes property for any of the columns in the TreeList.

2. Call the setOptions() method.

3. An error in the console is present.

https://dojo.telerik.com/OKUnEDiJ

### Environment

* **Kendo UI version:** 2020.3.1118
* **jQuery version:** 1.12.4
* **Browser:** [all[]

Please, add for TreeList support of setOptions and getOptions methods.

### Bug report

When the footerTemplate option of the TreeList is specified for a column that is part of a multi-column header configuration, the template is not rendered.

### Reproduction of the problem

1. Set a footerTemplate option for the nested column. Dojo sample for reproduction:

https://dojo.telerik.com/iKisAZaS/16

### Environment

* **Kendo UI version:** 2020.1.219
* **jQuery version:** 1.12.4
* **Browser:** [all ] 

### Bug report

The height of the locked content in Chrome with jQuery version 3.4.1 (all jQuery versions after 3.1.1) is not calculated correctly.

### Reproduction of the problem

1. Set locked content in the TreeList.
2. The height is not calculated correctly.

Dojo sample for reproduction:

 https://dojo.telerik.com/EsobuqAH

### Environment

* **Kendo UI version:** 2020.1.219
* **jQuery version:** 3.4.1
* **Browser:** [Chrome | IE | Edge] 

When the Kendo UI Treelist is horizontally scrollable and a filter is applied which returns no items, the scrollbar disappears. Therefore, if the column is one of the hidden ones, it would be impossible to navigate to it in order to clear the filter. 

A Dojo sample for the reproduction of the issue:

https://dojo.telerik.com/IQuHuNej

Great work on this control boys.... I reckon it needs Filter Row, Multiple Column Sort, Paging to make it consistent with the grid.

Regards,

Scotty

I would like to use drag and drop on treeList to reorder rows (with same parent) like on treeView or at least to have same events (drag, dragstart, dragend, drop), where I'll be able to change behaviour.

Is there any support for checkbox columns in the treelist to behave the same way as the kendoTreeView checkboxes? 

(ie, checking or unchecking parent should check/uncheck all children? and checking or unchecking children should update parent check state (possible indeterminate states))

When using the grid in navigatable mode, cells are correctly described, as seen in line 6014 of kendo.grid.js:

if (navigatable) {
   rowTemplate += ' aria-describedby=\'' + column.headerAttributes.id + '\'';
}

This simple, yet essential functionality is missing in TreeList.

When you add keybord navigation to the TreeList, alongside with the ability to drag and drop TreeList rows, keyboard events won't fire.

http://jsfiddle.net/ahz94f1j/2/

It looks more like an simple oversight, but we asked suppport and they responded that we should make a suggestion here.

Hi, 
it would be really helpful to have an event like beforeEdit (present in the Grid) in order to eventually cancel the edit event for certain rows.

For example: I want the user to be able to edit only nodes without children and, as today, i cannot cancel the edit event.

Tanks

Hi 

In the TreeList control when I Freeze first column and apply multi column header in some other column, then setting the filterable property for a column after multi column header is applied to some other column instead of the column on which it is set.

You can find a working sample here.

In this example note that I have set the filterable property false for field "Phone" but its effect is applied on "Position" field and its filters are hidden. Similarly if you apply filterable: false on "Extention" field then the filter on "Address" field will be gone.

Kindly provide a solution for this problem, also let me know if a work around exists for this issue.

Please add an ability to expand/collapse tab groups in treelist

As discussed on the forum (http://www.telerik.com/forums/virtualization-for-treelist) please improve the rendering/scrolling/expanding/collapsing performance of TreeLists with many expanded rows.

Grids support virtualization and work well with hundreds of thousands of rows (http://demos.telerik.com/kendo-ui/grid/virtualization-local-data). Perhaps virtualization can be added to TreeLists to achieve similar results?

Much like how the Grid has column grouping, it would be nice if the TreeList had this as well.

http://demos.telerik.com/kendo-ui/grid/multicolumnheaders

Request to add Batch Editing feature for Kendo Tree List