XRC Dialog utility classes

Hi,

trying to speed up the creation of simple dialogs based on XRC resource files,
I made a bunch of small utility classes, that I’d like to share with you:

http://terranuix.awardspace.info/XrcDialog/

Have a look at the example to see it in action.
I know that they are far from complete.

Feedback would be much appreciated:
Does something similar exist already?
Do you see immanent design flaws? What can be improved?