Two approaches. Either:
1) Use the OpenArgs argument of OpenReport to send a value that FormOpen or
Form_Load can use:
Button1_Click: DoCmd.OpenReport "myFormWithTabs",,,,,,'0'
Button2_Click: DoCmd.OpenReport "myFormWithTabs",,,,,,'1'
Form_Open: Me.MyTabControl = Cint(nz(Me.OpenArgs,'0')
or
2) Open the form and set the tab from Button2_Click:
DoCmd.OpenReport "myFormWithTabs"
Forms("myFormWithTabs").MyTabControl = 1
All the above is aircode.

Signature
HTH,
George
> In Form_Open:
> Me.MyTabControl = 1
[quoted text clipped - 8 lines]
>> What's the code to open a form with 2nd tab focused instead of default
>> 1st tab?