the SetDialogBoxMode-command allows GDI-forms in fullscreen-mode. For example changing the D3DApp-Unit to

function CD3DApplication.UserSelectNewDevice: HRESULT;
var
settingsDialog: CD3DSettingsDialog;
begin
if not m_bWindowed then
begin
m_pd3dDevice.SetDialogBoxMode(True)
..........

works pretty well.

Question: I would like to use VCL-Forms instead of resources, because it's much more comfortable to create them with the IDE. A simple MyForm.Showmodal is obviously not sufficient...
Any ideas how to call the form?

Carsten