Simple Code In 'Private Sub'

I usually create fairly simple macros using 'button' feature. However, now I'm using the 'CommandButton', as I had to make buttons highlighted once selected - So I have a choice of five options, whichever the user chooses that option background changes, the others stay grey...anyway, thats the fancy-editing done, but now when i enter a simple instruction - hide rows function - I get the error message "Select method of range class failed"

Here is the full code - like i say it works fine when its just the editing, but when i try to actually hide rows it doesn't work. - I will also add that the code is inside 'Microsoft Excel Objects' and further 'Sheet 1 (INDEX)' - not a module - I'm not sure if this is important.

Private Sub JackStart_click()

JackStart.BackColor = 32896
JackStart.ForeColor = 16777215
JackStart.Font.Bold = True
Majix.BackColor = 8421504
Majix.ForeColor = 0
Majix.Font.Bold = False

Sheets("Bank Reconciliation").Select
Rows("3:3").Select
Selection.EntireRow.Hidden = True

Sheets("INDEX").Select
Range("A1").Select

End Sub