The 'Control has no parent window' exception is raised when clicking the Back button on a tile detail page if the tile control is located on a form whose FormStyle property is set to fsMDIForm

Dear sir/madam,

I have a question regarding your (VCL) TdxTileControl (12.2.4) in a Delphi XE2 application.

I am running into a problem using a DetailControl when the TdxTileControl is on an MDI form.

The situation is easy to reproduce :

Create a new VCL Forms application, containing just an empty form.

In the FormCreate event of this form, paste the following code :

Delphi
procedure TForm1.FormCreate(Sender: TObject);  
var  
  x: TListView;  
begin  
  objDashBoard := TdxTileControl.Create(Form1);  
  objDashBoard.Parent := Form1;  
  objDashBoard.Align := TAlign.alClient;  
  objDashBoard.OptionsView.ItemSize := 150;  
  objDashBoard.Visible := True;  

  objTile := objDashBoard.CreateItem(false);  
  self.objTile.Visible := True;  

  x := TListView.Create(Form1);  
  x.Parent := Form1;  
  self.objTile.DetailOptions.DetailControl := x;  
end;  

This example will work perfectly. When you click on the tile, an empty ListView will show up, and you can navigate back to the tiles using the back button.

Now to reproduce the error :

Change the FormStyle property of Form1 to fsMDIForm.

Now run the application again. Clicking the tile will show the empty ListView. When you press the back button after this, an error will show :

EInvalidOperation : Control '' has no parent window.

Can you fix this problem, or show me how to avoid it ? This application is an MDI application and I cannot change that…

Thanks in advance…