RAD Studio VCL Reference
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TTabSet.OnChange Event
TTabSet Class | TTabSet Members | Tabs Namespace | Description
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Occurs just before a new tab is selected.

Pascal
property OnChange: TTabChangeEvent;
C++
__property TTabChangeEvent OnChange;
Description

OnChange occurs just as the TabIndex value is about to change. To prevent the TabIndex value from changing, set AllowChange to false in the OnChange event handler. 

 

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