[Lasse]

Use your demo:

1. Set MainUnit's PanelContainer.Align = alClient

2. Set UnitFrameTabControl's frame Align = alClient

3. Run the demo.

4. Go to Examples of components -> Inherited from VCL -> Tabbed controls

5. Resize the application, everything is smooth

6. Change Extended borders mode to false

7. Now that same resizing (5) is flashing black background

Can I avoid this somehow when not using extended borders mode?

[Support]

Hello

These black rectangles are shown when but size of the control is changed, background is not rendered yet.

Extended borders solves this issue.

[Lasse]

I managed to solve this when not using extended borders mode:

Code:

procedure TBaseForm.FormCreate(Sender: TObject);
begin
inherited;

SetClassLong(Handle, GCL_HBRBACKGROUND, GetSysColorBrush(COLOR_WINDOW));
end;

[Support]

Thank you, I didn't knew this feature.

[Author]

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