arrow does not shown above version 2.4.0

Version 2.4.0 is the last one where I can see the arrow. For newer Versions I only see white where it should be.
I also tried the following:
```
val img : ImageView = ccp.findViewById(R.id.imageView_arrow)
img.setBackgroundColor(0x3A3535)
img.visibility = View.VISIBLE
```
But the arrow just does not want to show up above 2.4.0.

Also with all of the versions I tested I get a compilation error when I try to set the attribute ccpDialog_backgroundColor.

Reproduce the missing arrow in versions newer than 2.4.0 using the reported `R.id.imageView_arrow` lookup and compare it with 2.4.0. Inspect how `ccpDialog_backgroundColor` is declared and consumed; done means the arrow renders in newer versions and the attribute compiles when configured.

索引モデルが issue の本文から書いたものです。