[SOLVED]VBA - Button(Form Control)-Disable/Enable->Alternate Solution

I have a FORM CONTROL in my worksheet.

Example:

I have (3) Buttons (Form Control) in Sheet1, each buttons have macro on it when they've been click.

The problem is I want to DISABLE the functionality of the (3) Buttons when the user click it.

Named:
btn1
btn2
btn3

NOTE:

Developer tab -> Insert -> Buttons (Form Control)

Attachment:
SampleWorksheet.xlsb