Hello Steve,
This resizing and placing is all done within the ArrangeControls method of the CTestExecDlg class in the TestExecDlg.cpp file. Currently the code is designed to fill the TESTEXEC_DIALOG with the other dialogs, so that there is no white space. To disable this resizing or all the dialogs, or to implement your own code to resize controls you place on the form, you will need to modify this method. Many of the methods that are called that control the size of these dialogs are very well documented on www.msdn.com, which will be one of your best resources. If as you are doing this, you come across specific methods that you don't understand, or if you can be more specific as to a single task you are having trouble accomplishing, it will be easier for us to offer more specific advice.
NickB
National Instruments
Applications Engineering