On Wed, 17 Dec 2014, Kiên Nguyễn Tiến Trung wrote:

Could you please explain this problem? I think that Loading method should be 
called by streaming system.



This is by design.

The state of a component cannot be manipulated directly.

The csLoading state of a component is set by the reader by accessing the 
private fields of TComponent directly.
The author of fpGUI wanted to set the csLoading component without using a 
reader.

So the Loading() method was introduced to set csLoading, but it is by design 
not used by the reader.

Michael.
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