Can't add a record from a dialog

I would like to be able to allow a user to add a record from a dialog. But when I showForminDialog with a toolbar, everything on the toolbar to the left of the font is cut off. Is this a bug, or are users unable to add a record from a dialog?

Thanks,

Add a button to the screen that creates a new record. Most toolbars are not available in dialogs.

Thank you.