def METHOD_NAME(self):
    ScriptedLoadableModuleWidget.METHOD_NAME(self)
    # Instantiate and connect widgets ...
    #
    # Parameters Area
    #
    parametersCollapsibleButton = ctk.ctkCollapsibleButton()
    parametersCollapsibleButton.text = "Parameters"
    self.layout.addWidget(parametersCollapsibleButton)
    # Layout within the dummy collapsible button
    parametersFormLayout = qt.QFormLayout(parametersCollapsibleButton)
    # Apply Button
    #
    self.applyButton = qt.QPushButton("Apply")
    self.applyButton.toolTip = "Run the algorithm."
    self.applyButton.enabled = True
    parametersFormLayout.addRow(self.applyButton)
    # connections
    self.applyButton.connect('clicked(bool)', self.onApplyButton)
    # Add vertical spacer
    self.layout.addStretch(1)