TGFileDialog
This class creates a file selection dialog. It contains a combo box
to select the desired directory. A listview with the different
files in the current directory and a combo box with which you can
select a filter (on file extensions).
When creating a file dialog one passes a pointer to a TGFileInfo
object. In this object you can set the fFileTypes and fIniDir to
specify the list of file types for the filter combo box and the
initial directory. When the TGFileDialog ctor returns the selected
file name can be found in the TGFileInfo::fFilename field and the
selected directory in TGFileInfo::fIniDir. The fFilename and
fIniDir are deleted by the TGFileInfo dtor.
