Setting the Visible Property of a ComboBox based on the value of a CheckBox

I’m having a heck of a time with this. Basically, I’m creating a calculator that calculates the value of a building. I need to set the Visible property of a combo box to be true if a checkbox is not selected, and false if it is selected.

Currently, I’ve created a macro for the checkbox that runs when the checkbox is clicked. This is the macro, but it appears to do nothing.

Sub CheckBox3_Click()
If Checkbox3 = False Then
Sheet1.cmbGarage.Visible = True
Else
Sheet1.cmbGarage.Visible = False
End If
End Sub

The cmbGarage control was created off the Controls Toolbox, while the CheckBox3 checkbox was created using the Forms toolbox.

Thank you.