<TelerikWindow @bind-Top="@Top" @bind-Left="@Left" Centered="@Centered" @bind-Visible="@Visible">
    <WindowTitle>
        Title
    </WindowTitle>
    <WindowContent>
        Drag or resize the Window and center it afterwards...
    </WindowContent>
</TelerikWindow>

<TelerikButton OnClick="@( () => Visible = !Visible )">Toggle Window</TelerikButton>
<TelerikButton OnClick="@OnCenterClick">Center</TelerikButton>

@code {
    string Top { get; set; }
    string Left { get; set; }
    bool Centered = false;
    bool Visible { get; set; } = true;

    async Task OnCenterClick()
    {
        Visible = false;
        await Task.Delay(1);

        Top = Left = string.Empty;
        Visible = true;
    }
}