[quote user="Jan Slegr"]If you only need to display your dialog without any specific behaviour, you usually don't have to do anything[/quote]
The WinForms dialog works but is masked by MicroStation's main window if user clicks in MicroStation. I want my WinForm app. to remain a visible child window.
[quote user="Jan Slegr"]See the attached simple example[/quote]
Thanks!
[quote user="Jan Slegr"]The question is why to don't use WPF instead of WinForms[/quote]
A third-party plug-in requires WinForms.