RAD Studio VCL Reference
TButtonGroup.TargetIndexAt Method

Provides the target insertion index of a given coordinate (x,y). If the target is somewhere in or above the top half of a button, this method inserts an object above the button. If the target is somewhere in or below the bottom half of a button, the method inserts an object after the button.

function TargetIndexAt(const X: Integer; const Y: Integer): Integer;
__fastcall int TargetIndexAt(const int X, const int Y);
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