Radzen Blazor Dialog not disposed after close

Question

I open a Radzen Blazor Dialog like this:

<div>
  <a href="@file2" @onclick="@(async () => { var d = await     
    dialogService.OpenAsync<DrawerComponents.ShowFile>("Show File",
     new Dictionary<string, object>() { { "Path", file2} },
     new DialogOptions() { Width = "800px", Height = "600px" }); })"
    @onclick:preventDefault="true">
      @(file2.Substring(file2.LastIndexOf("/") + 1))
  </a>&nbsp;
  <RadzenButton ButtonStyle="ButtonStyle.Danger" Icon="close" Size="ButtonSize.Small" Click="@(args => DeleteFile(item.Id, file.Substring(file.LastIndexOf("\\") + 1)))">
  </RadzenButton>                        
</div>

When I open this dialog and view the file, then close dialog and then press delete button next to it, I recieve this error:

'The process cannot access the file 'C:\Users\...\drawerUpload\1\1\1\1\page3.jpeg' because it is being used by another process.'

When I delete the file without first viewing it, the delete is successful. So the Opened .razor file 'DrawerComponents.ShowFile' (that is opened by DialogService), is not disposed after viewing it.

Since I recieve a variable from dialogservice I tried to do these: d.Dispose(); d = null; and d.Close(); after opening that didn't work.

How to dispose this?