@Claudio – your best bet is to set the callback not on the Java component’s ComponentResizedCallback but rather on the containing panel’s SizeChangedFcn. For example:

% If the original control is a Java component placed using javacomponent():
[jhComponent, hContainer] = javacomponent(jComponent, ...);
set(hContainer, 'Units','normalized', 'SizeChangedFcn',cbFunc);

% If the original control is a Matlab component placed using uicontrol() etc.:
hPanel = uipanel('BorderType','none', 'SizeChangedFcn',cbFunc, ...);
hComponent = uicontrol(hPanel, ...)

jS = findjobj(findobj('Tag','lbox'));
jS.setVerticalScrollBarPolicy(21);
hjScrollPane = handle(jS,'CallbackProperties');
set(hjScrollPane,'ComponentResizedCallback',cbFunc);

Where cbFunc is defined as a handle to a function re applying the properties. Everything works fine (the callback is set fine and so on, I checked with findjobj GUI), until I resize the window, where the policy change reverts, as explained here.

The problem seems to be that “ComponentResizedCallback” is not getting called, I tried for instance cbFunc = @(h,e) disp('called'); and it really isn’t being called.

@Collin – use the checkClass utility

Can you tell me what the constructor syntax for a com.mathworks.mlwidgets.cwd.CwdDisplayPanel is, or how to go about determining it?

Collin

@Matthew – put it in the OutputFcn – the underlying Java component might still not be available in the OpeningFcn.