Custom layout in java, can't find multiple buttons in the layout

[zgao67]

Trying to use custom layout in java
In this layout, I have 3 buttons - button 1, button 2, button3
When I click each button, it'd trigger different functions
Version is 5.0.0
I used .getLayoutContainer().findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {
....., it worked for button1.
But i can't do another .getLayoutContainer to find button2 or 3.
Can you help me out?
Also it'd be great if you can post some sample code for this.
Many thanks