.k-tabstrip .k-wizard .k-stepper .k-step {
  pointer-events: none;
}

<TelerikButton OnClick="@DisableItem">Disable Services item</TelerikButton>
<TelerikButton OnClick="@EnableItem">Enable Services item</TelerikButton>

@if (ShowMenu)
{
    <TelerikMenu Data="@MenuItems" />
}

@code {
    List<MenuItem> MenuItems { get; set; }

    bool ShowMenu { get; set; } = true;

    async Task DisableItem()
    {
        MenuItems.Find(x => x.Text == "Services").Disabled = true;

        MenuItems = new List<MenuItem>(MenuItems);

        // workaround start
        ShowMenu = false;
        await Task.Delay(1);
        ShowMenu = true;
        // workaround end
    }

    async Task EnableItem()
    {
        MenuItems.Find(x => x.Text == "Services").Disabled = false;

        MenuItems = new List<MenuItem>(MenuItems);
    }

    protected override void OnInitialized()
    {
        MenuItems = new List<MenuItem>()
    {
            new MenuItem()
            {
                Text = "Company",
                Items = new List<MenuItem>()
                {
                    new MenuItem()
                    {
                        Text = "Overview"
                    },
                    new MenuItem()
                    {
                        Text = "Events"
                    }
                }
            },
            new MenuItem()
            {
                Text = "Services",
                Items = new List<MenuItem>()
                {
                    new MenuItem()
                    {
                        Text = "Consulting"
                    },
                    new MenuItem()
                    {
                        Text = "Education"
                    }
                }
            }
        };

        base.OnInitialized();
    }

    public class MenuItem
    {
        public string Text { get; set; }
        public bool Disabled { get; set; }
        public List<MenuItem> Items { get; set; }
    }
}

<TelerikDialog @bind-Visible="@Visible"
               Title="@Title">
    <DialogContent>
        <TelerikGrid Data=@GridData Pageable="true" Height="400px" Width="700px">
            <GridToolBar>
                <span class="k-toolbar-spacer"></span> @* add this spacer to keep the searchbox on the right *@
                <div onkeydown="event.stopPropagation()">
                    <GridSearchBox />
                </div>
            </GridToolBar>
            <GridColumns>
                <GridColumn Field="@(nameof(Employee.EmployeeId))" />
                <GridColumn Field=@nameof(Employee.Name) />
                <GridColumn Field=@nameof(Employee.Team) Title="Team" />
                <GridColumn Field=@nameof(Employee.IsOnLeave) Title="On Vacation" />
            </GridColumns>
        </TelerikGrid>
    </DialogContent>
</TelerikDialog>

@code {
    private bool Visible { get; set; } = true;
    private string Title { get; set; } = "Software Update";

    public List<Employee> GridData { get; set; }

    protected override void OnInitialized()
    {
        GridData = new List<Employee>();
        var rand = new Random();
        for (int i = 0; i < 15; i++)
        {
            GridData.Add(new Employee()
                {
                    EmployeeId = i,
                    Name = "Employee " + i.ToString(),
                    Team = "Team " + i % 3,
                    IsOnLeave = i % 2 == 0
                });
        }
    }

    public class Employee
    {
        public int EmployeeId { get; set; }
        public string Name { get; set; }
        public string Team { get; set; }
        public bool IsOnLeave { get; set; }
    }
}

<TelerikTreeView @ref="@TreeViewRef"
                 Data="@FlatData"
                 @bind-ExpandedItems="@ExpandedItems"
                 SelectionMode="@TreeViewSelectionMode.Multiple"
                 SelectedItems="@SelectedItems"
                 SelectedItemsChanged="@((IEnumerable<object> items) => SelectedItemsHandler(items))" />

<TelerikButton OnClick="@ExpandAll">Expand All</TelerikButton>
<TelerikButton OnClick="@CollapseAll">Collapse All</TelerikButton>

@code {
    public TelerikTreeView TreeViewRef { get; set; }
    public IEnumerable<TreeItem> FlatData { get; set; }
    public IEnumerable<object> SelectedItems { get; set; } = new List<object>();
    public IEnumerable<object> ExpandedItems { get; set; } = new List<object>();

    async Task ExpandAll()
    {
        ExpandedItems = FlatData.Where(x => x.HasChildren == true);

        await Task.Delay(1);
        TreeViewRef.Rebind();
    }

    void CollapseAll()
    {
        ExpandedItems = new List<object>();
        SelectedItems = new List<object>();
    }

    void SelectedItemsHandler(IEnumerable<object> items)
    {
        SelectedItems = items;
    }
    protected override async void OnInitialized()
    {
        FlatData = LoadFlat();
    }

    int TreeLevels { get; set; } = 3;
    int ItemsPerLevel { get; set; } = 3;
    int IdCounter { get; set; } = 1;
    List<TreeItem> LoadFlat()
    {
        List<TreeItem> items = new List<TreeItem>();
        PopulateTreeItems(items, null, 1);
        return items;
    }
    void PopulateTreeItems(List<TreeItem> items, int? parentId, int level)
    {
        for (int i = 1; i <= ItemsPerLevel; i++)
        {
            var itemId = IdCounter++;
            items.Add(new TreeItem()
            {
                Id = itemId,
                Text = $"Level {level} Item {i} Id {itemId}",
                ParentId = parentId,
                HasChildren = level < TreeLevels
            });
            if (level < TreeLevels)
            {
                PopulateTreeItems(items, itemId, level + 1);
            }
        }
    }

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

<EditForm Model="@_data">
    <label>Condition 1 (InputCheckbox):</label>
    <InputCheckbox @bind-Value="@_data.Value1" />
    <br />
    @if (_data.Value1)
    {
        <label>Result 2</label>
        <InputCheckbox DisplayName="Result 2:" @bind-Value="@_data.Value2"></InputCheckbox>
    }
</EditForm>

<h1>TelerikForm</h1>

<TelerikForm Model="@_data">
    <FormItems>
        <FormItem LabelText="Condition 1 (FormItem):" Field="@nameof(_data.Value1)"></FormItem>
        <FormItem>
            <Template>
                <label for="x">Condition 1 (TelerikCheckBox):</label>
                <br />
                <TelerikCheckBox Id="x" @bind-Value="_data.Value1" />
            </Template>
        </FormItem>
        @if (_data.Value1)
        {
            <FormItem LabelText="Result 2:" Field="@nameof(_data.Value2)"></FormItem>
        }
    </FormItems>
</TelerikForm>

@code {
    private ExampleDto _data { get; set; } = new ExampleDto();

    public class ExampleDto
    {
        public string TextValue { get; set; }
        public bool Value1 { get; set; }
        public bool Value2 { get; set; }
    }
}