RAD Studio VCL Reference
TCheckListBox.AllowGrayed Property

Determines whether check box can be in a "grayed" state.

property AllowGrayed: Boolean;
__property Boolean AllowGrayed;

If AllowGrayed is set to true, each item has three possible states: checked, unchecked, and grayed. If AllowGrayed is set to false, each item has only two possible states: checked and unchecked.

Note: It is also possible to disable individual items while still showing whether they are checked or unchecked. To disable items without using the grayed state, use the ItemEnabled property.

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