private JCheckBox createUseForAllCheckBox() {
		useForAllCB = new GCheckBox(getUseAllString("Memory Block"));
		useForAllCB.setName(USE_FOR_ALL_CHECKBOX);
		return useForAllCB;
	}
Get the selected option; called after the Apply button was hit.
Ghidra/Features/Base/src/main/java/ghidra/app/merge/memory/MemoryMergePanel.java