RAD Studio VCL Reference
THeader.OnSizing Event

Occurs before the header is resized.

property OnSizing: TSectionEvent;
__property TSectionEvent OnSizing;

Write an OnSizing event handler to perform special processing immediately before the header is resized. In this event, AWidth is the width that the section will have after it is resized. Use the SectionWidth property to determine the current size of the section. 


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