Opendialog in dephi open dialog box behind other popup windows. How to take it at front

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Delphi

EditParent.OpenDlg.InitialDir := EditParent.FDefaultDir;
 EditParent.OpenDlg.FileName := EditParent.FFileName;

  EditParent.OpenDlg.Execute

This is my code to open file dialog in delphi. problem is window is open but it is at background of other windows of my application itself. I am new in delphi Please help which property should i use. Delphi version 5

What I have tried:

<pre> EditParent.OpenDlg.InitialDir := EditParent.FDefaultDir;
  EditParent.OpenDlg.FileName := EditParent.FFileName;

   EditParent.OpenDlg.Execute 

I am using OpenDialog in Delphi 5. My problem is it opens at the back of My Application forms. I set My application form at the TOP using following code

if UpperCase(SmSession.ApplicationName) = 'MYAPP' then
begin
  Params.ExStyle := Params.ExStyle or WS_EX_TOPMOST;
  exit;
end
, so the windows dialog box might be at the back. How can I take it to front without changing my application forms code ?

This is my code to openDialog:

EditParent.OpenDlg.InitialDir := EditParent.FDefaultDir;
EditParent.OpenDlg.FileName := EditParent.FFileName;

if EditParent.OpenDlg.Execute then
Begin
  SplitFileDir(EditParent.OpenDlg.FileName, TmpDir, TmpFile);
  if EditParent.ShowOnlyFileName then
    EditParent.FileName := TmpFile
  else
    EditParent.FileName := EditParent.OpenDlg.FileName;
  EditParent.Directory := TmpDir;
  EditParent.SetPeerDirectoryBrowser;
End;
EditParent.OpenDlg.Free;
inherited Click;
end;