Only some drawables are accessible via the syntax. For example expander_ic_maximized is not accessible, yet its cle
syntax. For example expander_ic_maximized is not accessible, yet its cle
I realize it's a bit more work, but as a workaround you could just set the image resource programatically.
findViewById(R.id.ImageButton1).setImageResource(android.R.drawable.expander_ic_maximized)