Gives you the target insertion point in the given group. TargetButton may be nil while the TargetCategory is not, or both may be nil.

procedure GetTargetAt(X: Integer; Y: Integer; var TargetButton: TButtonItem; var TargetCategory: TButtonCategory);

__fastcall GetTargetAt(int X, int Y, TButtonItem TargetButton, TButtonCategory TargetCategory);