wpf - The memory usage shown in memory profiler is different from Process Explorer

Question

I'm learning to use .Net Memory Profiler and testing the memory usage of Microsoft's DataBindingLab sample project.

.Net Memory Profiler shows total live bytes are 2011015, ie. 2MB.

Process Explorer shows Private Bytes are 56MB.

Obviously, there is such a big difference between the value given by the two tools. Where does the remaining 54MB come from?