Runtime Language Switching for Inherited Forms
It appears that inherited forms (i.e. forms that use visual inheritance) do not appear in the list of components in the Runtime Language Switching dialog. Therefore, there is no way to automatically generate an ml_UpdateControls() routine for any child forms, and hence, you can't dynamically update the controls at runtime without reloading the form.
What would need to be done in the base form:
Protected Sub ml_UpdateControls()
'load text for controls on base form
And on the child form:
Protected Overrides Sub ml_UpdateControls()
MyBase.ml_UpdateControls()
'load text for controls on this form