RadzenTextBox onkeydown Event

i am using RadzenDataGrid DataGrid InCell Editing and I have RadzenTextBox inside it. i put onkeydown event and click event in RadzenTextBox coz i need mouse event and keyboard event both. but when i add Change event onkeydown event is not triggered.
below is my code:

<RadzenTextBox @bind-Value:event="oninut"
@onkeydown="OnDepCodeKeyDown" @ref="editor" Change="@(args => Update())" @bind-Value="Department.DepDescription" Style="width:200px; display: block" Name="ShipCountry" aria-label="Enter ship country" />


@code{
protected async Task OnDepCodeKeyDown(KeyboardEventArgs e)
{
if (e.Key == "ArrowDown")
{
// await Update(+1);
}
else if (e.Key == "ArrowUp")
{
//await Update(-1);
}
}
async Task Update()
{
}

}