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automation using pywinauto

I am trying to automate a couple of steps using pywinauto in python. I am trying to click the Button called "Test Instance" in the attached figure. The thing is that the name of the window is "Site Controller GUI Command Center - Version: 2.5.2.0 OfflineLSM"  is not recognized

Here is my tries :
from pywinauto import application
from pywinauto import findwindows
from pywinauto import timings
from pywinauto import application
#initialize an instance of the Application class
app = application.Application()
app=app.Start("C:hdmttos_2.5.2.0_releasetosreleasebinreleaseHdstSiteGuiWPF.exe")
dlg='Site Controller GUI Command Center - Version: 2.5.2.0 OfflineLSM'
app.dlg.TestInstance.Click()
#print app._findwindows.find_windows()
#app.top_window_().print_control_identifiers()