[TxMt] tm_dialog: add FileSelect + Appending Accessory Views

[Hans-Joerg Bibiko]

Hi,

I wonder if it possible 'easily' to enhance tm_dialog in a way that  
one can also use it as FileSelect dialog, like CocoaDialog it does,  
in conjunction with an user-defined nib-file to append a CustomView  
to the predefined NSOpenPanel.

For details have a look at:
http://developer.apple.com/documentation/Cocoa/Conceptual/AppFileMgmt/ 
Articles/ManagingAccessoryViews.html

E.g.:

tm_dialog -f

invokes a normal cocoa-based file select dialog.

tm_dialog -f myextension.nib

invokes a normal cocoa-based file select dialog and appends  
myextension.nib as an Accessory View.

tm_dialog -f -p THEPLIST

to set the current dir, which files are allowed to select, multiple  
file select yes/no, dialog title, etc.



The result is a plist containing the filename and, if an Accessory  
View is specified, the selections of it.


Hans