<TelerikButton OnClick="@(_ => OZRowCmd(null,20))" Icon="@FontIcon.Play" Title="Zahájit novou" Class="bg-primary" Size="@Telerik.Blazor.ThemeConstants.Button.Size.Large">Zahájit novou</TelerikButton>

@using System.Collections.Generic;
@using System.Dynamic;
    <span>Selection bind not working as expected:</span>
    <TelerikGrid TItem="ExpandoObject"
    @bind-SelectedItems="@gSelectedItems"
                 OnRowClick="@OnGridRowClicked"
                 SelectionMode="GridSelectionMode.Multiple"
                 OnRead=@gHLReadItems
                 RowHeight="60">
        <RowTemplate Context="ctx">
            <td>
                @{
                    var it = (ctx as IDictionary<string, object>);
                    @(it["Name"].ToString())
                }
            </td>
        </RowTemplate>
        <GridColumns>
            <GridCheckboxColumn CheckBoxOnlySelection="true" Visible="false" @key="@("sIDX1")" SelectAll="false" />
            <GridColumn Field="Name" FieldType=@typeof(string) Title="Name" />
        </GridColumns>
    </TelerikGrid>
<span>WORKs OK:</span>
    <TelerikGrid TItem="ExpandoObject"
    @bind-SelectedItems="@gSelectedItems"
                 OnRowClick="@OnGridRowClicked"
                 SelectionMode="GridSelectionMode.Multiple"
                 OnRead=@gHLReadItems
                 RowHeight="60">
        <GridColumns>
            <GridCheckboxColumn CheckBoxOnlySelection="true" Visible="false" @key="@("sIDX2")" SelectAll="false" />
            <GridColumn Field="Name" FieldType=@typeof(string) Title="Name" />
        </GridColumns>
    </TelerikGrid>
        
@code
{
    private List<ExpandoObject> RowData;
    IEnumerable<ExpandoObject> gSelectedItems { get; set; } = Enumerable.Empty<ExpandoObject>();
    protected override void OnInitialized()
    {
        
        RowData = new List<ExpandoObject>();
        dynamic obj0 = new ExpandoObject();
        obj0.Name = "Tester";
        RowData.Add(obj0);
        dynamic obj1 = new ExpandoObject();
        obj1.Name = "Testovicz";
        RowData.Add(obj1);
        dynamic obj2 = new ExpandoObject();
        obj2.Name = "Selectant";
        RowData.Add(obj2);
    }
    protected async Task gHLReadItems(GridReadEventArgs args)
    {
        //RowData are readen from DYNAMIC source, cannot add any NEW property to it
        args.Data = RowData;
        args.Total = 3;
    }
    protected void OnGridRowClicked(GridRowClickEventArgs args)
    {
        var it = args.Item as ExpandoObject;
        if (gSelectedItems.Any(x => x == it))
        {
            gSelectedItems = gSelectedItems.Where(x => x != it);
        }
        else
        {
            gSelectedItems = gSelectedItems.Union(RowData.Where(x => x == it));
        }
    }
}

<TelerikGrid Data="listOfFoos" SelectionMode="GridSelectionMode.Multiple">
    <GridColumns>
        <GridCheckboxColumn SelectAll="true" SelectAllMode="GridSelectAllMode.All"  />
        <GridColumn Field="@nameof(Foo.Name)" Title="Name" />
    </GridColumns>
</TelerikGrid>

public class Foo {
    public string Name { get; set; }
}
public List<Foo> listOfFoos = [ new Foo{Name="First"}, new Foo{Name="Second"}, new Foo{Name="Third"} ];
   

<TelerikGrid Data="@gridDataExpando" Width="100%" Sortable="false" Pageable="false" Resizable="true" ShowColumnMenu="false"
             ScrollMode="@GridScrollMode.Scrollable"
             Height="100%"
             EditMode="@GridEditMode.Incell"
             OnUpdate="@UpdateHandlerExpando"
             OnEdit="@EditHandler">
   <GridColumns>
      @{
         var firstItem = gridDataExpando.FirstOrDefault();
         if (firstItem != null)
         {
            var dictionaryItem = firstItem as IDictionary<string, object>;
            foreach (var item in dictionaryItem)
            {
               if (!item.Key.Contains("Id"))
               {
                  <GridColumn Field="@(item.Key)" FieldType="@(this.GetDataType(item.Key))" Width="140px" DisplayFormat="{0:hh:mm:ss tt}">
                     <HeaderTemplate>
                        <span>@item.Key</span>
                    </HeaderTemplate>
                   </GridColumn>
               }
            }
         }
      }
   </GridColumns>
</TelerikGrid>

<GridColumnMenuSettings
	FilterMode="@ColumnMenuFilterMode.None"
	Lockable="true"
	ShowColumnChooser="true"
	Groupable="false"
	Sortable="false"
	Reorderable="false">
</GridColumnMenuSettings>