[Ivan_009]

Gnom_aka_Lexander, Если я правильно понял то как то так:

Код:

 
var 
BGBitmapImage: TBitmapImage; 

procedure InitializeWizard();
begin
ExtractTemporaryFile('BGImage.bmp');

BGBitmapImage := TBitmapImage.Create(WizardForm);
BGBitmapImage.Parent := WizardForm;
BGBitmapImage.Align := alClient;
BGBitmapImage.SendToBack;
BGBitmapImage.Bitmap.LoadFromFile(ExpandConstant('{tmp}\BGImage.bmp'))

with WizardForm.ComponentsList do
begin
//BorderStyle := bsNone;
Parent := WizardForm;
SetBounds(ScaleX(110), ScaleY(180), ScaleX(350), ScaleY(120));
Font.Color:=$FFFFFF;
Font.Name:='MS Sans Serif';
Font.Size:= 9;
TreeViewStyle := True;

WizardForm.ComponentsList.LoadBGBmpFromBitmap(BGBitmapImage.Bitmap, WizardForm.ComponentsList.Left, WizardForm.ComponentsList.Top);
end;
end;

procedure CurPageChanged(CurPageID: Integer);
begin
WizardForm.ComponentsList.Hide;
BGBitmapImage.Hide;
case CurPageID of
wpSelectComponents:
begin
WizardForm.ComponentsList.Show;
BGBitmapImage.Show;
end;
end;
end;