Throwing errors using NET listeners implemented in a class

I'm implementing a .NET listener to run Matlab callbacks on a .NET application whenever certain buttons are clicked. This is done in a class, based on the instructions here:

https://www.mathworks.com/matlabcentral/answers/49240-how-can-i-write-net-event-in-c-and-attach-a-matlab-callabk-to-them

These callbacks are supposed to throw errors as popups if the input is incorrect, and they use the error() function to do this. However, when I run the callbacks using the listeners, anything thrown using the error() function gets downgraded to a warning, and it prints in the Command Window instead of showing as a popup. It looks like this:

Warning: Error occurred while executing the listener callback for event Click defined for class System.Windows.Forms.Button:
Error using GetCanConfigForm/btnCreateSimFunc_Listener (line 75)
Please enter the CAN Rx Msg function name to create.

I can catch these "warnings" using try-catch & rethrow the errors using errordlg(). This does make a popup, but the OK buttons on the errordlg popups do nothing instead of closing the popup as expected. The X in the top right corner does work to close the popup.

How do I either force error() to throw popups in this context, or fix the errordlg() OK button to close the popup?

(Using Matlab R2019a)

Answer 1

[Katherine May]

I found a fix for the errordlg OK button - I needed to add waitfor():

f = errordlg(errtxt, 'CAN Rx Msg Error');
waitfor(f);

uiwait(f) also works.