private void initializeContents() {
		if (goToMemory) {
			comboBox.selectAll();
			comboBox.requestFocus();
		}
		else {
			comboBox.setSelectedItem(null);
		}
	}
Popup up the dialog in the center of the tool.
@param nav the Navigatable
@param addr the address
@param tool the PluginTool
Ghidra/Features/Base/src/main/java/ghidra/app/util/navigation/GoToAddressLabelDialog.java