You can use registry to set IE version for webbrowser control.
Go to: HKLM\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION and add "yourApplicationName.exe" with value of browser_emulation
To see value of browser_emulation, refer link: http://msdn.microsoft.com/en-us/library/ee330730%28VS.85%29.aspx#browser_emulation