enable/disable of state button under program control doesn't work

I have a state button called MyButton in mlapp which is enabled

Then I have a program line:

app.myButton.Enable = false;

Executing this line doesn't disable the button.

Setting a breakpoint and executing the same line from the Matlab Command Window also has no effect and also doesn't report any error.

The enable Field remains at 'on'

app.myButton.Enable = 'off''; from the command line

also doesn't work, the field Enable remains at 'on' and no error is reported

This behaviour is erratic, i.e. I have another state button where disabling works

I didn't observe this problem with standard buttons

[Thomas Laubscher]

It looks as if there was still a thread running which updated the knobs appearance even after halting at a breakpoint. Therefore consider this problem solved.