Always a handy tip:
In Visual Studio Choose "Options..." from the "Tools" menu.
Expand "Source Control" in the treeview.
Click "Visual Studio Team Foundation Server" in the treeview.
Click the "Configure User Tools..." button.
Click the "Add..." button.
Enter ".*" in the "Extension" edit.
Choose "Compare" in the "Operation" combobox.
Enter the path to BC2.exe in the "Command" edit.
Enter "%1 %2 /title1=%6 /title2=%7" in the "Arguments" edit.
Then Choose "Merge" in the "Operation" combobox.
Enter the path to BC2.exe in the "Command" edit.
Enter "%1 %2 /mergeoutput=%4 /title1=ThisComputer /title2=SourceControl" in the "Arguments" edit.