You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: stlButtonCallback.m
    path of file: ./repos/WEC-Sim/source/functions/simulink/mask
    
    the code of the file until where you have to start completion: function stlButtonCallback(blockHandle)
% Callback function for STLbutton

    
function stlButtonCallback(blockHandle)
% Callback function for STLbutton
% Allows user to specify what .stl file to use for body

    [filename,filepath] = uigetfile('.stl');               % Return filename, filepath of user-chosen file
    % Don't set value if no file is chosen, or prompt canceled.
    if ~isequal(filename,0) && ~isequal(filepath,0)
        mask = Simulink.Mask.get(blockHandle);
        fileParam = mask.getParameter('geometryFile');
        fileParam.Value = [filepath,filename];             % Update geometryFile with new filename
    end