error in using get function

I have some code in which the line:

multiFileWrite = 0;
multiFileWrite = get(h.extractSeparate,'Value');

within a gui doesn't work despite the function header having the gui h passed to it:

function readAndWriteMessages(src,~,h,~,~,~,~,~,~,~,~)

which doesn't make sense to me because I have another use of h in the same function with get that is working just fine. the following error is what I am getting:

No appropriate method, property, or field 'extractSeparate' for class 'matlab.ui.Figure'.

[Adam Danz]

Could you post the relevant code?

[Adam]

Where is extractSeparate defined? did you spell it correctly? What are the fields of 'h' if you use a breakpoint or the Stop/Pause on errors option? Also if h is a matlab.ui.figure then you would not expect it to have an arbitrary property that you have defined. Your h is a handle to the figure, not to the application that contains all the UI components that are in the figure.