Refer to forms control checkbox in VBA when it is part of a group

Hello,

This code to uncheck a forms control checkbox works when the checkbox exists by itself on the worksheet.

Sheets("Sheet1").Shapes("CheckBox_1").ControlFormat.Value = 0

But how do you refer to the checkbox when the checkbox is grouped with other checkboxes and textboxes? These do not work:

Sheets("Sheet1").Shapes.Range(Array("GroupName").Shapes("CheckBox_1")).ControlFormat.Value = 0

Sheets("Sheet1").Shapes.Range(Array("GroupName")).Shapes("CheckBox_1").ControlFormat.Value = 0

thanks