private CompilerElement getSelectedCompilerElement() {
		if (selectionModel.isSelectionEmpty()) {
			return null;
		}
		int selectedRow = extensionTable.getSelectedRow();
		return tableElements.get(selectedRow);
	}
Present the user with a confirmation dialog.  If confirmed, mark
the selected element for removal.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/processors/sleigh/SpecExtensionPanel.java