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MQL5 ReferenceStandard LibraryPanels and DialogsCCheckGroupRowState 

RowState

Sets the state of the specified item.

bool  RowState(
   const int   index,      // item index
   const bool  select      // state
   )

Parameters

index

[in]  Item index to change.

select

[in]  New state.

Return Value

true - successful, otherwise - false.