Initialize the DialogWrapper

The only extra functionality here is to modify self.friendlyclassname to make it "Dialog" if the class is "#32770" otherwise to leave it the same as the window class.

Run the tests on dialog

Write the dialog an XML file (requires elementtree)

Return the client area rectangle

From MSDN The client area of a control is the bounds of the control, minus the nonclient elements such as scroll bars, borders, title bars, and menus.