TConditionalFormatDefIconSet.CheckIsValid Method
Checks if the format definition is valid. This check will be applied automatically when you try to add a conditional format to a sheet, so there is no need to call this method directly. But you can use it to know if a conditional format will be rejected when you try to add it.
Syntax
Unit: FlexCel.Core
function TConditionalFormatDefIconSet.CheckIsValid: TCondFmtError; override;