Application message loop

[piac]

Using Form.Show() or Form.Show(Rhino.RhinoApp.MainWindow()) does not trigger proper tab behavior between controls in the non-modal form. (Usually, if you push "Tab" in a windows form, you get to move from one control to the next).

It seems that the origin of the problem is the fact that there is no proper WinForm message loop that is registered on the UI thread, but the unmanaged host is taking care of handling all messages. Application.MessageLoop returns false if queried.

It seems we are in a similar situation as this one: http://stackoverflow.com/questions/7604111/why-does-application-idle-never-fire-when-my-form-is-hosted-in-a-mfc-application There are some possible ways to circumvent this problem, and these are outlined on that page

[piac]

As outlined in those questions, using Form.ShowDialog() enables the tab behavior.

[sbaer]

John, I think you may have already fixed this but I guess we need to double check

[johnmorse]

I fixed it in controls embedded in Rhino docking windows, this still appears to be a problem doing something simple like this: var form = new MyForm(); form.Show(Rhino.RhinoApp.MainWindow());

I display a form with 3 TextBox controls and am unable to tab between them, I will investigate further and see if I can figure out why.

[johnmorse]

MSDN Documents this as a know problem here: http://support.microsoft.com/kb/233263

[johnmorse]

I cooked up a sample https://github.com/mcneel/rhinocommon/tree/master/examples/ModelessFormTabProblem which demonstrates how to make this work, see the Form1 class for implementation.