### Bug report

The DropDownTree TagHelper with enabled checkboxes does not submit the selected options when it is bound to a Model property.

### Reproduction of the problem

1. Define a DropDownTree TagHelper as a form editor and and enable its checkboxes.

2. Bind the editor to a Model property (an array of integers).

3. Submit the form and examine the submit request payload. The values of the selected items are missing.

//Model
public class TestFormModelClass
{
  public int[] MonthsSelectedIds { get; set; }
}

//View
@model TestFormModelClass

<form method="post">
  <kendo-dropdowntree for="MonthsSelectedIds" 
      check-all="true"
      datatextfield="Month"
      datavaluefield="Id">
      <hierarchical-datasource type="DataSourceTagHelperType.Custom">
                <schema>
                    <hierarchical-model id="id"></hierarchical-model>
                </schema>
                <transport>
                    <read url="/api/items" />
                </transport>
      </hierarchical-datasource>
      <checkboxes check-children="false" name="CheckedMonths" enabled="true" />
  </kendo-dropdowntree>

  <button type="submit">Save</button>
</form>

### Expected/desired behavior

When the DropDownTree TagHelper with checkboxes is used as a form editor, the values of the selected items must be submitted as expected to the server.

### Workaround

Use the HtmlHelper version of the DropDownTree

### Environment

* **Telerik UI for ASP.NET Core version: 2024.1.319
* **Browser: [all]

Bug report

DropDownTreeFor with checkboxes enabled is not binding to model value after postback.

Reproduction of the problem

Use the following definition of a DropDownTreeFor HtmlHelper in a plain HTML form, where MySelectedIds is int[]:

 @(Html.Kendo().DropDownTreeFor(m => m.MyClass.MySelectedIds)
             .Checkboxes(checkboxes => checkboxes
                 .CheckChildren(false)
             )
             .DataTextField("MyText")
             .DataValueField("MyId")
             .AutoClose(false)
             .CheckAll(true)
             .DataSource(dataSource => dataSource
                 .Custom()
                 .Transport(t => t
                     .Read(r => r.Url("/api/items"))
                 )
             )
 )

Current behavior

The DropDownTree is bound to the model value on page load, but on successful form submission and returning the model the DropDownTree is not bound to the data. Refer to ticket 1648108 for a runnable example.

Expected/desired behavior

The DropDownTree should be bound to the model value after successful form submission.

Workaround

Bind the model to a string[] instead of int[].

Environment

• Kendo UI version: 2024.1.319