When laying out a group, the Windows Ribbon Framework supports some predefined layouts. One of the layouts, which requires four buttons is called FourButtons. 
This layout supports 3 different sizes, Large, Medium, and Small. In each case it gives the layouts:
Large:

Medium:

Small:

Right now i am using the FourButtons predefined template in my xml file as:
<?xml version="1.0" encoding="utf-8"?>
<Application xmlns="http://schemas.microsoft.com/windows/2009/Ribbon">
   ...
   <Application.Views>
      <Ribbon>
         ...
         <Ribbon.Tabs>
            <Tab CommandName="tabHome">
               <Group CommandName="grpActivity" SizeDefinition="FourButtons">
                  <Button CommandName="cmdStartWorking" />
                  <Button CommandName="cmdStopWorking" />
                  <Button CommandName="cmdPrint" />
                  <Button CommandName="cmdDuplicateTicket" />
               </Group>
            </Tab>
         </Ribbon.Tabs>
      </Ribbon>
   </Application.Views>
</Application>
And you can see the line
<Group CommandName="grpActivity" SizeDefinition="FourButtons">
which specifies the FourButtons layout template. 
And my layout is FourButtons:
Except i don't want FourButtons layout, i want "Four Buttons, Two Big Two Small".
In the same way that there is ThreeButtons-OneBigAndTwoSmall:

And there is a FiveButtons:

i want a FourButtons-TwoBigTwoSmall, which i can manually mockup:
Unfortunately declarative programming that Microsoft invented for creating custom layouts confounds me as a programmer.
Can anyone decipher the declarative language example at the bottom of the page and come up with a FourButton-TwoBigTwoSmall template?
Note: All the pretty graphics, formatting, links, and stuff are used to attract squirrels - who love shiny graphics. And if you actually read this far i could actually use your help.


                        
you should use BigButtonsAndSmallButtonsOrInputs SizeDefinition
e.g.
Just check, if your Group has Size="Large" in your Tab.ScalingPolicy.