How can I programmitcally "click" on a block mask action button?

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I have a Simulink block which is masked. The mask contains an action button which will modify the block contents when "clicked". I need to be able to script the clicking of the button for all instances of the block. Since this block will be linked to a library the modification has to occur with in the Mask's workspace.
I've looked at the Simulink.Mask and DialogControl objects, but there is no method to envoke the button's callback, only 'get' the callback code as a string.
Is what I'm trying to do possible, and if so how?
>> errMask = Simulink.Mask.get(gcb)
errMask =
Mask with properties:
Type: 'Set_Error'
Description: '<p><font size=+3 color="#990000">Set Error</font></p>
<p>This block sets the system error status for the error specifi...'
Help: 'web('sfun_Set_Error_help.html', '-helpbrowser');'
Initialization: ''
SelfModifiable: 'on'
Display: 'disp(['Set Error' char(10) char(10) err_id]);'
IconFrame: 'on'
IconOpaque: 'on'
RunInitForIconRedraw: 'off'
IconRotate: 'none'
PortRotate: 'default'
IconUnits: 'autoscale'
Parameters: [1x1 Simulink.MaskParameter]
BaseMask: []
>> errBtn = errMask.getDialogControl('update_btn')
errBtn =
Button with properties:
Name: 'update_btn'
Prompt: 'Update'
Callback: 'set_error_data_stores(gcb);
FilePath: ''
Row: 'current'
Enabled: 'on'
Visible: 'on'
>> errBtn.Callback
ans =
set_error_data_stores(gcb); disp('hello');
  1 Comment
Nirav Ambaliya
Nirav Ambaliya on 29 May 2018
Hi Jason,
Were you able to solve the problem? I am also trying to do the same thing.
Thanks, Nirav

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Answers (2)

Arnab Sen
Arnab Sen on 22 Feb 2016
Hi Jason, I understand that you would like to execute the callback programmatically.
You can use the 'evalin' function to achieve this goal as follows:
For more details refer to the following link:
  1 Comment
jason on 22 Feb 2016
Doesn't evalin only use either the 'base' or 'function' workspace? What if I need it to run in the mask's workspace?

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TAB on 30 May 2018
In my understanding, Dialog Control callback is not executed in Mask workspace.
It is executed in Base workspace. Even though it is not documented explicitly, you can easily check this yourself:
  • Create a simple mask with a button and few mask parameters.
  • Now try to access a mask parameter in button callback. Eg. fprintf('Mask Param Val = %f', MyMaskParam); When you press the button you will get error.
  • Now try opposite. Print base workspace variable and it will work.
So in your case, you can call set_error_data_stores(gcb) from any in script/function to emulate the button press.


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