[Lazarus] csOpaque seems to be broken in 0.9.29

[Graeme Geldenhuys]

Paul Ishenin wrote:
>>   
> csOpaque is a hint which component gives to lcl whether it fully draws 
> itself or not. It does not mean that component should be drawn 
> transparently.


To be fair, I did try and find help on csOpaque, but there was none. I then
searched the LCL and found the following code with comment. I assumed from
that, that csOpaque means the component will be transparent.

----------------------------------
constructor TCustomPanel.Create(TheOwner : TComponent);
begin
  inherited Create (TheOwner);
  FCompStyle:= csPanel;
  ControlStyle := ControlStyle + [csAcceptsControls, csCaptureMouse,
    csClickEvents, csSetCaption, csDoubleClicks, csReplicatable,
    csNoFocus]
    - [csOpaque]; // we need the default background
...
----------------------------------


> Moreover it can't work for TWinControl which has a window 
> - HWND or GdkWindow since that windows are not transparent.

So how else would you create a transparent container component in LCL?


Regards,
  - Graeme -

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