RAD Studio VCL Reference
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TToolButton.Indeterminate Property

Indicates that the tool button is neither selected nor unselected.

Pascal
property Indeterminate: Boolean;
C++
__property Boolean Indeterminate;

Indeterminate provides a third state for tool buttons that are neither selected nor unselected. Set this property in program code to indicate that a button is inapplicable in a particular context. Buttons with the Indeterminate property set to true appear grayed. 

When Indeterminate is set to true, Down is automatically set to false. 

 

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