DropDownTreeValue1: @DropDownTreeValue1
<br />
DropDownTreeValue2: @DropDownTreeValue2

<br />

Bug:
<TelerikDropDownTree Data="@DropDownTreeData"
                     @bind-Value="@DropDownTreeValue1"
                     @bind-ExpandedItems="@DropDownTreeExpandedItems"
                     Width="300px">
</TelerikDropDownTree>

Workaround:
<TelerikDropDownTree Data="@DropDownTreeData"
                     @bind-Value="@DropDownTreeValue2"
                     @bind-ExpandedItems="@DropDownTreeExpandedItems"
                     Width="300px">
</TelerikDropDownTree>

@* Render DropDownTree after setting Data *@
@if (DropDownTreeData is not null)
{
    <span>Workaround:</span>
    <TelerikDropDownTree Data="@DropDownTreeData"
                        @bind-Value="@DropDownTreeValue1"
                        @bind-ExpandedItems="@DropDownTreeExpandedItems"
                        Width="300px">
    </TelerikDropDownTree>
}

@code {
    private List<TreeItem>? DropDownTreeData { get; set; }

    private int DropDownTreeValue1 { get; set; }
    private int DropDownTreeValue2 { get; set; }

    private IEnumerable<object> DropDownTreeExpandedItems { get; set; } = new List<TreeItem>();

    protected override async Task OnInitializedAsync()
    {
        DropDownTreeValue1 = 3;
        await Task.Delay(1000);
        DropDownTreeData = LoadFlatData();

        // Set DropDownTree Value after setting Data
        DropDownTreeValue2 = 3;

        DropDownTreeExpandedItems = DropDownTreeData.Where(x => x.ParentId is null && x.HasChildren);
    }

    private int TreeLevels { get; set; } = 3;
    private int RootItems { get; set; } = 2;
    private int ItemsPerLevel { get; set; } = 2;
    private int IdCounter { get; set; }

    private List<TreeItem> LoadFlatData()
    {
        List<TreeItem> items = new List<TreeItem>();

        PopulateChildren(items, null, 1);

        return items;
    }

    private void PopulateChildren(List<TreeItem> items, int? parentId, int level)
    {
        var itemCount = level == 1 ? RootItems : ItemsPerLevel;
        for (int i = 1; i <= itemCount; i++)
        {
            var itemId = ++IdCounter;
            items.Add(new TreeItem()
            {
                Id = itemId,
                ParentId = parentId,
                HasChildren = level < TreeLevels,
                Text = $"Level {level} Item {i} Id {itemId}",
                Value = itemId
            });

            if (level < TreeLevels)
            {
                PopulateChildren(items, itemId, level + 1);
            }
        }
    }

    public class TreeItem
    {
        public int Id { get; set; }
        public int? ParentId { get; set; }
        public bool HasChildren { get; set; }
        public string Text { get; set; } = string.Empty;
        public int Value { get; set; }
    }
}

Signature Width: <TelerikNumericTextBox @bind-Value="@NumValue" Width="120px" />

<TelerikButton OnClick="@ResizeSignature">Resize Signature</TelerikButton>

<br /><br />

@if (ShowSignature)
{
    <TelerikSignature @bind-Value="@SignatureValue"
                      Width="@( $"{SignWidth}px" )"
                      Height="@( $"{SignHeight}px" )"
                      Maximizable="false">
    </TelerikSignature>
}

@code {
    private string SignatureValue { get; set; }

    private int NumValue { get; set; } = 300;

    private int SignWidth { get; set; }
    private int SignHeight { get; set; }

    private bool ShowSignature { get; set; } = true;

    async Task ResizeSignature()
    {
        ShowSignature = false;

        SignWidth = SignHeight = NumValue;

        await Task.Delay(1);

        ShowSignature = true;
    }

    protected override void OnInitialized()
    {
        SignWidth = SignHeight = NumValue;

        base.OnInitialized();
    }
}

@using Telerik.Blazor.Components.Editor

<TelerikEditor @bind-Value="@EditorValue"
               Tools="@ToolCollection"
               EditMode="@EditorEditMode.Div" />

<style>
.ProseMirror-selectednode {
  outline: 2px solid #8cf;
}
div.ProseMirror {
  position: relative;
  min-height: 100%;
  word-wrap: break-word;
  white-space: pre-wrap;
  white-space: break-spaces;
  -webkit-font-variant-ligatures: none;
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0; /* the above doesn't seem to work in Edge */
}
div.ProseMirror:focus {
  outline: none;
}
.ProseMirror pre {
  white-space: pre-wrap;
}
.ProseMirror-hideselection *::selection { background: transparent; }
.ProseMirror-hideselection *::-moz-selection { background: transparent; }
.ProseMirror-hideselection { caret-color: transparent; }
.ProseMirror li {
  position: relative;
}
li.ProseMirror-selectednode {
  outline: none;
}
li.ProseMirror-selectednode:after {
  content: "";
  position: absolute;
  left: -32px;
  right: -2px;
  top: -2px;
  bottom: -2px;
  border: 2px solid #8cf;
  pointer-events: none;
}
.ProseMirror-gapcursor {
  display: none;
  pointer-events: none;
  position: absolute;
}
.ProseMirror-gapcursor:after {
  content: "";
  display: block;
  position: absolute;
  top: -2px;
  width: 20px;
  border-top: 1px solid black;
  animation: ProseMirror-cursor-blink 1.1s steps(2, start) infinite;
}
@keyframes ProseMirror-cursor-blink {
  to {
    visibility: hidden;
  }
}
.ProseMirror-focused .ProseMirror-gapcursor {
  display: block;
}
.k-editor-resize-handles-wrapper {
  position: absolute;
  visibility: hidden;
}
.k-editor-resize-handle {
  position: absolute;
  visibility: visible;
  background-color: #fff;
  border: 1px solid #000;
  z-index: 100;
  width: 5px;
  height: 5px;
}
.k-editor-resize-handle.northwest {
  top: 0;
  left: 0;
  transform: translate(-50%, -50%);
  cursor: nw-resize;
}
.k-editor-resize-handle.north {
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: n-resize;
}
.k-editor-resize-handle.northeast {
  top: 0;
  right: 0;
  transform: translate(50%, -50%);
  cursor: ne-resize;
}
.k-editor-resize-handle.southwest {
  left: 0;
  bottom: 0;
  transform: translate(-50%, 50%);
  cursor: sw-resize;
}
.k-editor-resize-handle.south {
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 50%);
  cursor: s-resize;
}
.k-editor-resize-handle.southeast {
  right: 0;
  bottom: 0;
  transform: translate(50%, 50%);
  cursor: se-resize;
}
.k-editor-resize-handle.west {
  top: 50%;
  left: 0;
  transform: translate(-50%, -50%);
  cursor: w-resize;
}
.k-editor-resize-handle.east {
  top: 50%;
  right: 0;
  transform: translate(50%, -50%);
  cursor: e-resize;
}
.ProseMirror .tableWrapper {
  overflow-x: auto;
  margin: 1em 0;
}
.k-editor-resize-wrap-element {
  display: inline-block;
  position: relative;
}
.ProseMirror .row-resize-handle {
  position: absolute;
  right: 0; left: 0; bottom: 0;
  transform: translate(0, 50%);
  height: 4px;
  z-index: 20;
  background-color: #adf;
  pointer-events: none;
}
.ProseMirror.resize-cursor-vertical {
  cursor: sn-resize;
  cursor: row-resize;
}
.k-editor-resize-wrap-element table td p,
.k-editor-resize-wrap-element table th p {
  margin: 0 auto;
}
.ProseMirror table {
  margin: 0;
  border-collapse: collapse;
  table-layout: fixed;
  width: 100%;
  overflow: hidden;
}
.ProseMirror td, .ProseMirror th {
  min-width: 1em;
  border: 1px solid #ddd;
  padding: 3px 5px;
  vertical-align: top;
  box-sizing: border-box;
  position: relative;
}
.ProseMirror th {
  font-weight: bold;
  text-align: left;
}
.ProseMirror .column-resize-handle {
  position: absolute;
  right: -2px; top: 0; bottom: 0;
  width: 4px;
  z-index: 20;
  background-color: #adf;
  pointer-events: none;
}
.ProseMirror.resize-cursor {
  cursor: ew-resize;
  cursor: col-resize;
}
/* Give selected cells a blue overlay */
.ProseMirror .selectedCell:after {
  z-index: 2;
  position: absolute;
  content: "";
  left: 0; right: 0; top: 0; bottom: 0;
  background: rgba(200, 200, 255, 0.4);
  pointer-events: none;
}
</style>

@code {
    string EditorValue { get; set; }

    public List<IEditorTool> ToolCollection { get; set; } = new List<IEditorTool>() {
            new InsertTable()
        };
}